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Christianity[note 1] is an Abrahamic monotheistic religion based on the life and teachings of Jesus Christ, who is the focal point of the Christian faith. It is the world's largest religion, with over 2.4 billion followers, or 33% of the global population, known as Christians.[note 2] Christians make up a majority of the population in 158 countries and territories. They believe that Jesus is the Son of God and the savior of humanity whose coming as the Messiah (the Christ) was prophesied in the Old Testament. Christianity has played a prominent role in the shaping of Western civilization.
Christianity grew out of Judaism and began as a Second Temple Judaic sect in the mid-1st century. Originating in the Roman province of Judea, it quickly spread to Europe, Syria, Mesopotamia, Asia Minor, Transcaucasia, Egypt, Ethiopia and the Indian subcontinent, and by the end of the 4th century had become the official state church of the Roman Empire. Following the Age of Discovery, Christianity spread to the Americas, Oceania, sub-Saharan Africa and the rest of the world through missionary work and colonization.
Christian theology is summarized in creeds such as the Apostles' Creed and the Nicene Creed. These professions of faith state that Jesus suffered, died, was buried, descended into hell, and rose from the dead, in order to grant eternal life to those who believe in him and trust in him for the remission of their sins. The creeds further maintain that Jesus physically ascended into heaven, where he reigns with God the Father in the unity of the Holy Spirit, and that he will return to judge the living and the dead and grant eternal life to his followers. His incarnation, earthly ministry, crucifixion and resurrection are often referred to as "the gospel", meaning "good news".[note 3] The term gospel also refers to written accounts of Jesus' life and teaching, four of which—Matthew, Mark, Luke, and John—are considered canonical and included in the Christian Bible, as established by the 5th century for the ancient undivided Catholic and Eastern Orthodox traditions before the East–West Schism.
Throughout its history, Christianity has weathered schisms and theological disputes that have resulted in many distinct churches and denominations. Worldwide, the largest branches of Christianity are the Catholic Church, the Eastern Orthodox Church, Oriental Orthodoxy, as well as thousands of denominations and congregations of Protestantism, the latter due to fundamentally different ecclesiology. The Catholic and Eastern Orthodox churches broke communion with each other in the East–West Schism of 1054. Protestantism came into existence in the Protestant Reformation in the 16th century, splitting from the Catholic Church.
There are many important differences of interpretation and opinion of the Bible and sacred tradition on which Christianity is based. Because of these irreconcilable differences in theology and a lack of consensus on the core tenets of Christianity, Catholics, Protestants and Orthodox often deny that members of certain other branches are Christians.
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Concise doctrinal statements or confessions of religious beliefs are known as creeds (from Latin credo, meaning "I believe"). They began as baptismal formulae and were later expanded during the Christological controversies of the 4th and 5th centuries to become statements of faith.
Many evangelical Protestants reject creeds as definitive statements of faith, even while agreeing with some or all of the substance of the creeds. The Baptists have been non-creedal "in that they have not sought to establish binding authoritative confessions of faith on one another.":p.111 Also rejecting creeds are groups with roots in the Restoration Movement, such as the Christian Church (Disciples of Christ), the Evangelical Christian Church in Canada and the Churches of Christ.:14–15:123
The Apostles' Creed is the most widely accepted statement of the articles of Christian faith. It is used by a number of Christian denominations for both liturgical and catechetical purposes, most visibly by liturgical churches of Western Christian tradition, including the Latin Church of the Catholic Church, Lutheranism, Anglicanism and Western Rite Orthodoxy. It is also used by Presbyterians, Methodists and Congregationalists. This particular creed was developed between the 2nd and 9th centuries. Its central doctrines are those of the Trinity and God the Creator. Each of the doctrines found in this creed can be traced to statements current in the apostolic period. The creed was apparently used as a summary of Christian doctrine for baptismal candidates in the churches of Rome.
Its main points include:
The Nicene Creed was formulated, largely in response to Arianism, at the Councils of Nicaea and Constantinople in 325 and 381 respectively  and ratified as the universal creed of Christendom by the First Council of Ephesus in 431.
The Chalcedonian Definition, or Creed of Chalcedon, developed at the Council of Chalcedon in 451, though rejected by the Oriental Orthodox churches, taught Christ "to be acknowledged in two natures, inconfusedly, unchangeably, indivisibly, inseparably": one divine and one human, and that both natures, while perfect in themselves, are nevertheless also perfectly united into one person.
The Athanasian Creed, received in the Western Church as having the same status as the Nicene and Chalcedonian, says: "We worship one God in Trinity, and Trinity in Unity; neither confounding the Persons nor dividing the Substance."
The central tenet of Christianity is the belief in Jesus as the Son of God and the Messiah (Christ). Christians believe that Jesus, as the Messiah, was anointed by God as savior of humanity, and hold that Jesus' coming was the fulfillment of messianic prophecies of the Old Testament. The Christian concept of the Messiah differs significantly from the contemporary Jewish concept. The core Christian belief is that through belief in and acceptance of the death and resurrection of Jesus, sinful humans can be reconciled to God and thereby are offered salvation and the promise of eternal life.
While there have been many theological disputes over the nature of Jesus over the earliest centuries of Christian history, generally Christians believe that Jesus is God incarnate and "true God and true man" (or both fully divine and fully human). Jesus, having become fully human, suffered the pains and temptations of a mortal man, but did not sin. As fully God, he rose to life again. According to the New Testament, he rose from the dead, ascended to heaven, is seated at the right hand of the Father and will ultimately return[Acts 1:9–11] to fulfill the rest of Messianic prophecy, including the resurrection of the dead, the Last Judgment and final establishment of the Kingdom of God.
According to the canonical gospels of Matthew and Luke, Jesus was conceived by the Holy Spirit and born from the Virgin Mary. Little of Jesus' childhood is recorded in the canonical gospels, although infancy gospels were popular in antiquity. In comparison, his adulthood, especially the week before his death, is well documented in the gospels contained within the New Testament, because that part of his life is believed to be most important. The biblical accounts of Jesus' ministry include: his baptism, miracles, preaching, teaching and deeds.
Christians consider the resurrection of Jesus to be the cornerstone of their faith (see 1 Corinthians 15) and the most important event in history. Among Christian beliefs, the death and resurrection of Jesus are two core events on which much of Christian doctrine and theology is based. According to the New Testament, Jesus was crucified, died a physical death, was buried within a tomb and rose from the dead three days later.[Jn. 19:30–31] [Mk. 16:1] [16:6]
The New Testament mentions several resurrection appearances of Jesus on different occasions to his twelve apostles and disciples, including "more than five hundred brethren at once",[1Cor 15:6] before Jesus' Ascension to heaven. Jesus' death and resurrection are commemorated by Christians in all worship services, with special emphasis during Holy Week which includes Good Friday and Easter Sunday.
The death and resurrection of Jesus are usually considered the most important events in Christian theology, partly because they demonstrate that Jesus has power over life and death and therefore has the authority and power to give people eternal life.
Christian churches accept and teach the New Testament account of the resurrection of Jesus with very few exceptions. Some modern scholars use the belief of Jesus' followers in the resurrection as a point of departure for establishing the continuity of the historical Jesus and the proclamation of the early church. Some liberal Christians do not accept a literal bodily resurrection, seeing the story as richly symbolic and spiritually nourishing myth. Arguments over death and resurrection claims occur at many religious debates and interfaith dialogues. Paul the Apostle, an early Christian convert and missionary, wrote, "If Christ was not raised, then all our preaching is useless, and your trust in God is useless."[1Cor 15:14] 
Paul the Apostle, like Jews and Roman pagans of his time, believed that sacrifice can bring about new kinship ties, purity and eternal life. For Paul, the necessary sacrifice was the death of Jesus: Gentiles who are "Christ's" are, like Israel, descendants of Abraham and "heirs according to the promise".[Gal. 3:29]  The God who raised Jesus from the dead would also give new life to the "mortal bodies" of Gentile Christians, who had become with Israel the "children of God" and were therefore no longer "in the flesh".[Rom. 8:9,11,16] 
Modern Christian churches tend to be much more concerned with how humanity can be saved from a universal condition of sin and death than the question of how both Jews and Gentiles can be in God's family. According to both Catholic and Protestant doctrine, salvation comes by Jesus' substitutionary death and resurrection. The Catholic Church teaches that salvation does not occur without faithfulness on the part of Christians; converts must live in accordance with principles of love and ordinarily must be baptized. Martin Luther taught that baptism was necessary for salvation, but modern Lutherans and other Protestants tend to teach that salvation is a gift that comes to an individual by God's grace, sometimes defined as "unmerited favor", even apart from baptism.
Christians differ in their views on the extent to which individuals' salvation is pre-ordained by God. Reformed theology places distinctive emphasis on grace by teaching that individuals are completely incapable of self-redemption, but that sanctifying grace is irresistible. In contrast Catholics, Orthodox Christians and Arminian Protestants believe that the exercise of free will is necessary to have faith in Jesus.
Trinity refers to the teaching that the one God comprises three distinct, eternally co-existing persons; the Father, the Son (incarnate in Jesus Christ) and the Holy Spirit. Together, these three persons are sometimes called the Godhead, although there is no single term in use in Scripture to denote the unified Godhead. In the words of the Athanasian Creed, an early statement of Christian belief, "the Father is God, the Son is God and the Holy Spirit is God, and yet there are not three Gods but one God". They are distinct from another: the Father has no source, the Son is begotten of the Father and the Spirit proceeds from the Father. Though distinct, the three persons cannot be divided from one another in being or in operation. While some Christians also believe that God appeared as the Father in the Old Testament, it is agreed that he appeared as the Son in the New Testament, and will still continue to manifest as the Holy Spirit in the present. But still, God still existed as three persons in each of these times. However, traditionally there is a belief that it was the Son who appeared in the Old Testament because, for example, when the Trinity is depicted in art, the Son typically has the distinctive appearance, a cruciform halo identifying Christ, and in depictions of the Garden of Eden this looks forward to an Incarnation yet to occur. In some Early Christian sarcophagi the Logos is distinguished with a beard, "which allows him to appear ancient, even preexistent."
The Trinity is an essential doctrine of mainstream Christianity. From earlier than the times of the Nicene Creed, 325, Christianity advocated the triune mystery-nature of God as a normative profession of faith. According to Roger E. Olson and Christopher Hall, through prayer, meditation, study and practice, the Christian community concluded "that God must exist as both a unity and trinity", codifying this in ecumenical council at the end of the 4th century. 
According to this doctrine, God is not divided in the sense that each person has a third of the whole; rather, each person is considered to be fully God (see Perichoresis). The distinction lies in their relations, the Father being unbegotten; the Son being begotten of the Father; and the Holy Spirit proceeding from the Father and (in Western Christian theology) from the Son. Regardless of this apparent difference, the three "persons" are each eternal and omnipotent. Other Christian religions including Unitarian Universalism, Jehovah's Witnesses, Mormonism and others do not share those views on the Trinity.
The Latin word trias, from which trinity is derived, is first seen in the works of Theophilus of Antioch. He wrote of "the Trinity of God (the Father), His Word (the Son) and His Wisdom (Holy Spirit)". The term may have been in use before this time. Afterwards it appears in Tertullian. In the following century the word was in general use. It is found in many passages of Origen.
Trinitarianism denotes those Christians who believe in the concept of the Trinity. Almost all Christian denominations and churches hold Trinitarian beliefs. Although the words "Trinity" and "Triune" do not appear in the Bible, theologians beginning in the 3rd century developed the term and concept to facilitate comprehension of the New Testament teachings of God as being Father, Son and Holy Spirit. Since that time, Christian theologians have been careful to emphasize that Trinity does not imply that there are three gods (the antitrinitarian heresy of Tritheism), nor that each hypostasis of the Trinity is one-third of an infinite God (partialism), nor that the Son and the Holy Spirit are beings created by and subordinate to the Father (Arianism). Rather, the Trinity is defined as one God in three Persons.
Nontrinitarianism (or antitrinitarianism) refers to theology that rejects the doctrine of the Trinity. Various nontrinitarian views, such as adoptionism or modalism, existed in early Christianity, leading to the disputes about Christology. Nontrinitarianism later appeared again in the Gnosticism of the Cathars in the 11th through 13th centuries, among groups with Unitarian theology in the Protestant Reformation of the 16th century, in the 18th-century Enlightenment and in some groups arising during the Second Great Awakening of the 19th century.
Christianity, like other religions, has adherents whose beliefs and biblical interpretations vary. Christianity regards the biblical canon, the Old Testament and the New Testament, as the inspired word of God. The traditional view of inspiration is that God worked through human authors so that what they produced was what God wished to communicate. The Greek word referring to inspiration in 2 Timothy 3:16 is theopneustos, which literally means "God-breathed".
Some believe that divine inspiration makes our present Bibles inerrant. Others claim inerrancy for the Bible in its original manuscripts, although none of those are extant. Still others maintain that only a particular translation is inerrant, such as the King James Version. Another closely related view is Biblical infallibility or limited inerrancy, which affirms that the Bible is free of error as a guide to salvation, but may include errors on matters such as history, geography or science.
The books of the Bible accepted by the Orthodox, Catholic and Protestant churches vary somewhat, with Jews accepting only the Hebrew Bible as canonical; there is however substantial overlap. These variations are a reflection of the range of traditions, and of the councils that have convened on the subject. Every version of the Old Testament always includes the books of the Tanakh, the canon of the Hebrew Bible. The Catholic and Orthodox canons, in addition to the Tanakh, also include the Deuterocanonical Books as part of the Old Testament. These books appear in the Septuagint, but are regarded by Protestants to be apocryphal. However, they are considered to be important historical documents which help to inform the understanding of words, grammar and syntax used in the historical period of their conception. Some versions of the Bible include a separate Apocrypha section between the Old Testament and the New Testament. The New Testament, originally written in Koine Greek, contains 27 books which are agreed upon by all churches.
Modern scholarship has raised many issues with the Bible. While the Authorized King James Version is held to by many because of its striking English prose, in fact it was translated from the Erasmus Greek Bible which in turn "was based on a single 12th Century manuscript that is one of the worst manuscripts we have available to us". Much scholarship in the past several hundred years has gone into comparing different manuscripts in order to reconstruct the original text. Another issue is that several books are considered to be forgeries. The injunction that women "be silent and submissive" in 1 Timothy 2 is thought by many to be a forgery by a follower of Paul, a similar phrase in 1 Corinthians 14, which is thought to be by Paul, appears in different places in different manuscripts and is thought to originally be a margin note by a copyist. Other verses in 1 Corinthians, such as 1 Corinthians 11:2–16 where women are instructed to wear a covering over their hair "when they pray or prophesies", contradict this verse.
A final issue with the Bible is the way in which books were selected for inclusion in the New Testament. Other Gospels have now been recovered, such as those found near Nag Hammadi in 1945, and while some of these texts are quite different from what Christians have been used to, it should be understood that some of this newly recovered Gospel material is quite possibly contemporaneous with, or even earlier than, the New Testament Gospels. The core of the Gospel of Thomas, in particular, may date from as early as AD 50 (although some major scholars contest this early dating), and if so would provide an insight into the earliest gospel texts that underlie the canonical Gospels, texts that are mentioned in Luke 1:1–2. The Gospel of Thomas contains much that is familiar from the canonical Gospels—verse 113, for example ("The Father's Kingdom is spread out upon the earth, but people do not see it"), is reminiscent of Luke 17:20–21—and the Gospel of John, with a terminology and approach that is suggestive of what was later termed Gnosticism, has recently been seen as a possible response to the Gospel of Thomas, a text that is commonly labelled proto-Gnostic. Scholarship, then, is currently exploring the relationship in the Early Church between mystical speculation and experience on the one hand and the search for church order on the other, by analyzing new-found texts, by subjecting canonical texts to further scrutiny, and by an examination of the passage of New Testament texts to canonical status.
In antiquity, two schools of exegesis developed in Alexandria and Antioch. Alexandrine interpretation, exemplified by Origen, tended to read Scripture allegorically, while Antiochene interpretation adhered to the literal sense, holding that other meanings (called theoria) could only be accepted if based on the literal meaning.
The literal sense of understanding scripture is the meaning conveyed by the words of Scripture. The spiritual sense is further subdivided into:
Regarding exegesis, following the rules of sound interpretation, Catholic theology holds:
Some Protestant interpreters make use of typology.
The end of things, whether the end of an individual life, the end of the age, or the end of the world, broadly speaking is Christian eschatology; the study of the destiny of humans as it is revealed in the Bible. The major issues in Christian eschatology are the Tribulation, death and the afterlife, the Rapture, the Second Coming of Jesus, Resurrection of the Dead, Heaven and Hell, Millennialism, the Last Judgment, the end of the world and the New Heavens and New Earth.
Christians believe that the second coming of Christ will occur at the end of time after a period of severe persecution (the Great Tribulation). All who have died will be resurrected bodily from the dead for the Last Judgment. Jesus will fully establish the Kingdom of God in fulfillment of scriptural prophecies.
Most Christians believe that human beings experience divine judgment and are rewarded either with eternal life or eternal damnation. This includes the general judgement at the resurrection of the dead as well as the belief (held by Roman Catholics, Orthodox and most Protestants) in a judgment particular to the individual soul upon physical death.
In Roman Catholicism, those who die in a state of grace, i.e., without any mortal sin separating them from God, but are still imperfectly purified from the effects of sin, undergo purification through the intermediate state of purgatory to achieve the holiness necessary for entrance into God's presence. Those who have attained this goal are called saints (Latin sanctus, "holy").
Some Christian groups, such as Seventh-day Adventists, hold to mortalism, the belief that the human soul is not naturally immortal, and is unconscious during the intermediate state between bodily death and resurrection. These Christians also hold to Annihilationism, the belief that subsequent to the final judgement, the wicked will cease to exist rather than suffer everlasting torment. Jehovah's Witnesses hold to a similar view.
Justin Martyr described 2nd-century Christian liturgy in his First Apology (c. 150) to Emperor Antoninus Pius, and his description remains relevant to the basic structure of Christian liturgical worship:
And on the day called Sunday, all who live in cities or in the country gather together to one place, and the memoirs of the apostles or the writings of the prophets are read, as long as time permits; then, when the reader has ceased, the president verbally instructs, and exhorts to the imitation of these good things. Then we all rise together and pray, and, as we before said, when our prayer is ended, bread and wine and water are brought, and the president in like manner offers prayers and thanksgivings, according to his ability, and the people assent, saying Amen; and there is a distribution to each, and a participation of that over which thanks have been given, and to those who are absent a portion is sent by the deacons. And they who are well to do, and willing, give what each thinks fit; and what is collected is deposited with the president, who succours the orphans and widows and those who, through sickness or any other cause, are in want, and those who are in bonds and the strangers sojourning among us, and in a word takes care of all who are in need.
Thus, as Justin described, Christians assemble for communal worship on Sunday, the day of the resurrection, though other liturgical practices often occur outside this setting. Scripture readings are drawn from the Old and New Testaments, but especially the gospel accounts. Often these are arranged on an annual cycle, using a book called a lectionary. Instruction is given based on these readings, called a sermon, or homily. There are a variety of congregational prayers, including thanksgiving, confession and intercession, which occur throughout the service and take a variety of forms including recited, responsive, silent, or sung. The Lord's Prayer, or Our Father, is regularly prayed.
Some groups depart from this traditional liturgical structure. A division is often made between "High" church services, characterized by greater solemnity and ritual, and "Low" services, but even within these two categories there is great diversity in forms of worship. Seventh-day Adventists meet on Saturday, while others do not meet on a weekly basis. Charismatic or Pentecostal congregations may spontaneously feel led by the Holy Spirit to action rather than follow a formal order of service, including spontaneous prayer. Quakers sit quietly until moved by the Holy Spirit to speak.
Some evangelical services resemble concerts with rock and pop music, dancing and use of multimedia. For groups which do not recognize a priesthood distinct from ordinary believers the services are generally led by a minister, preacher, or pastor. Still others may lack any formal leaders, either in principle or by local necessity. Some churches use only a cappella music, either on principle (for example, many Churches of Christ object to the use of instruments in worship) or by tradition (as in Orthodoxy).
Nearly all forms of churchmanship celebrate the Eucharist (Holy Communion), which consists of a consecrated meal. It is reenacted in accordance with Jesus' instruction at the Last Supper that his followers do in remembrance of him as when he gave his disciples bread, saying, "This is my body", and gave them wine saying, "This is my blood". Some Christian denominations practice closed communion. They offer communion to those who are already united in that denomination or sometimes individual church. Catholics restrict participation to their members who are not in a state of mortal sin. Most other churches practice open communion since they view communion as a means to unity, rather than an end, and invite all believing Christians to participate.
Worship can be varied for special events like baptisms or weddings in the service or significant feast days. In the early church, Christians and those yet to complete initiation would separate for the Eucharistic part of the worship. In many churches today, adults and children will separate for all or some of the service to receive age-appropriate teaching. Such children's worship is often called Sunday school or Sabbath school (Sunday schools are often held before rather than during services).
In Christian belief and practice, a sacrament is a rite, instituted by Christ, that confers grace, constituting a sacred mystery. The term is derived from the Latin word sacramentum, which was used to translate the Greek word for mystery. Views concerning both which rites are sacramental, and what it means for an act to be a sacrament, vary among Christian denominations and traditions.
The most conventional functional definition of a sacrament is that it is an outward sign, instituted by Christ, that conveys an inward, spiritual grace through Christ. The two most widely accepted sacraments are Baptism and the Eucharist (or Holy Communion), however, the majority of Christians also recognize five additional sacraments: Confirmation (Chrismation in the Orthodox tradition), Holy orders (ordination), Penance (or Confession), Anointing of the Sick and Matrimony (see Christian views on marriage).
Taken together, these are the Seven Sacraments as recognized by churches in the High Church tradition—notably Roman Catholic, Eastern Orthodox, Oriental Orthodox, Independent Catholic, Old Catholic, many Anglicans and some Lutherans. Most other denominations and traditions typically affirm only Baptism and Eucharist as sacraments, while some Protestant groups, such as the Quakers, reject sacramental theology. Christian denominations, such as Baptists, which believe these rites do not communicate grace, prefer to call Baptism and Holy Communion ordinances rather than sacraments.
In addition to this, the Church of the East has two additional sacraments in place of the traditional sacraments of Matrimony and the Anointing of the Sick. These include Holy Leaven (Melka) and the sign of the cross.
Service of the Sacrament of Holy Unction served on Great and Holy Wednesday
Roman Catholics, Anglicans, Eastern Christians and traditional Protestant communities frame worship around the liturgical year. The liturgical cycle divides the year into a series of seasons, each with their theological emphases, and modes of prayer, which can be signified by different ways of decorating churches, colours of paraments and vestments for clergy, scriptural readings, themes for preaching and even different traditions and practices often observed personally or in the home.
Western Christian liturgical calendars are based on the cycle of the Roman Rite of the Catholic Church, and Eastern Christians use analogous calendars based on the cycle of their respective rites. Calendars set aside holy days, such as solemnities which commemorate an event in the life of Jesus, Mary or the saints, and periods of fasting, such as Lent and other pious events such as memoria or lesser festivals commemorating saints. Christian groups that do not follow a liturgical tradition often retain certain celebrations, such as Christmas, Easter and Pentecost: these are the celebrations of Christ's birth, resurrection and the descent of the Holy Spirit upon the Church, respectively. A few denominations make no use of a liturgical calendar.
Christianity has not generally practiced aniconism, or the avoidance or prohibition of types of images, even if the early Jewish Christians sects, as well as some modern denominations, preferred to some extent not to use figures in their symbols, by invoking the Decalogue's prohibition of idolatry.
The cross, which is today one of the most widely recognized symbols in the world, was used as a Christian symbol from the earliest times. Tertullian, in his book De Corona, tells how it was already a tradition for Christians to trace repeatedly on their foreheads the sign of the cross. Although the cross was known to the early Christians, the crucifix did not appear in use until the 5th century.
Among the symbols employed by the primitive Christians, that of the fish or Ichthys seems to have ranked first in importance. From monumental sources such as tombs it is known that the symbolic fish was familiar to Christians from the earliest times. The fish was depicted as a Christian symbol in the first decades of the 2nd century. Its popularity among Christians was due principally, it would seem, to the famous acrostic consisting of the initial letters of five Greek words forming the word for fish (Ichthys), which words briefly but clearly described the character of Christ and the claim to worship of believers: Iesous Christos Theou Yios Soter (Ίησοῦς Χριστός, Θεοῦ Υἱός, Σωτήρ), meaning, Jesus Christ, Son of God, Savior.
Other major Christian symbols include the chi-rho monogram, the dove (symbolic of the Holy Spirit), the sacrificial lamb (symbolic of Christ's sacrifice), the vine (symbolizing the necessary connectedness of the Christian with Christ) and many others. These all derive from writings found in the New Testament.
Baptism is the ritual act, with the use of water, by which a person is admitted to membership of the Church. Beliefs on baptism vary among denominations. Differences occur firstly on whether the act has any spiritual significance. Some, such as the Catholic and Eastern Orthodox churches, as well as Lutherans and Anglicans, hold to the doctrine of baptismal regeneration, which affirms that baptism creates or strengthens a person's faith, and is intimately linked to salvation. Others view baptism as a purely symbolic act, an external public declaration of the inward change which has taken place in the person, but not as spiritually efficacious. Secondly, there are differences of opinion on the methodology of the act. These methods are: by immersion; if immersion is total, by submersion; by affusion (pouring); and by aspersion (sprinkling). Those who hold the first view may also adhere to the tradition of infant baptism; the Orthodox Churches all practice infant baptism and always baptize by total immersion repeated three times in the name of the Father, the Son and the Holy Spirit. The Catholic Church also practices infant baptism, usually by affusion, and utilizing the Trinitarian formula.
Jesus' teaching on prayer in the Sermon on the Mount displays a distinct lack of interest in the external aspects of prayer. A concern with the techniques of prayer is condemned as 'pagan', and instead a simple trust in God's fatherly goodness is encouraged.[Mat. 6:5–15] Elsewhere in the New Testament this same freedom of access to God is also emphasized.[Phil. 4:6][Jam. 5:13–19] This confident position should be understood in light of Christian belief in the unique relationship between the believer and Christ through the indwelling of the Holy Spirit.
In subsequent Christian traditions, certain physical gestures are emphasized, including medieval gestures such as genuflection or making the sign of the cross. Kneeling, bowing and prostrations (see also poklon) are often practiced in more traditional branches of Christianity. Frequently in Western Christianity the hands are placed palms together and forward as in the feudal commendation ceremony. At other times the older orans posture may be used, with palms up and elbows in.
Intercessory prayer is prayer offered for the benefit of other people. There are many intercessory prayers recorded in the Bible, including prayers of the Apostle Peter on behalf of sick persons[Acts 9:40] and by prophets of the Old Testament in favor of other people.[1Ki 17:19–22] In the Epistle of James, no distinction is made between the intercessory prayer offered by ordinary believers and the prominent Old Testament prophet Elijah.[Jam 5:16–18] The effectiveness of prayer in Christianity derives from the power of God rather than the status of the one praying.
The ancient church, in both Eastern Christianity and Western Christianity, developed a tradition of asking for the intercession of (deceased) saints, and this remains the practice of most Eastern Orthodox, Oriental Orthodox, Roman Catholic, and some Anglican churches. Churches of the Protestant Reformation, however, rejected prayer to the saints, largely on the basis of the sole mediatorship of Christ. The reformer Huldrych Zwingli admitted that he had offered prayers to the saints until his reading of the Bible convinced him that this was idolatrous.
According to the Catechism of the Catholic Church: "Prayer is the raising of one's mind and heart to God or the requesting of good things from God." The Book of Common Prayer in the Anglican tradition is a guide which provides a set order for church services, containing set prayers, scripture readings, and hymns or sung Psalms.
Christianity began as a Jewish sect in the Levant of the middle east in the mid-1st century. Other than Second Temple Judaism, the primary religious influences of early Christianity are Zoroastrianism and Gnosticism.[note 2] John Bowker states that Christian ideas such as "angels, the end of the world, a final judgment, the resurrection and heaven and hell received form and substance from ... Zoroastrian beliefs". Its earliest development took place under the leadership of the remaining Twelve Apostles, particularly Saint Peter, and Paul the Apostle, followed by the early bishops, whom Christians consider the successors of the Apostles.
According to the Christian scriptures, Christians were from the beginning subject to persecution by some Jewish and Roman religious authorities, who disagreed with the apostles' teachings (See Split of early Christianity and Judaism). This involved punishments, including death, for Christians such as Stephen[Acts 7:59] and James, son of Zebedee.[Acts 12:2] Larger-scale persecutions followed at the hands of the authorities of the Roman Empire, first in the year 64, when Emperor Nero blamed them for the Great Fire of Rome. According to Church tradition, it was under Nero's persecution that early Church leaders Peter and Paul of Tarsus were each martyred in Rome.
Further widespread persecutions of the Church occurred under nine subsequent Roman emperors, most intensely under Decius and Diocletian. From the year 150, Christian teachers began to produce theological and apologetic works aimed at defending the faith. These authors are known as the Church Fathers, and study of them is called Patristics. Notable early Fathers include Ignatius of Antioch, Polycarp, Justin Martyr, Irenaeus, Tertullian, Clement of Alexandria and Origen. However, Armenia is considered the first nation to accept Christianity in AD 301.
King Trdat IV made Christianity the state religion in Armenia between 301 and 314, it was not an entirely new religion in Armenia. It penetrated into the country from at least the third century, but may have been present even earlier.
State persecution ceased in the 4th century, when Constantine I issued an edict of toleration in 313. On 27 February 380, Emperor Theodosius I enacted a law establishing Nicene Christianity as the state church of the Roman Empire. From at least the 4th century, Christianity has played a prominent role in the shaping of Western civilization.
Constantine was also instrumental in the convocation of the First Council of Nicaea in 325, which sought to address the Arian heresy and formulated the Nicene Creed, which is still used by the Catholic Church, Eastern Orthodoxy, Anglican Communion and many Protestant churches. Nicaea was the first of a series of Ecumenical (worldwide) Councils which formally defined critical elements of the theology of the Church, notably concerning Christology. The Assyrian Church of the East did not accept the third and following Ecumenical Councils, and are still separate today.
The presence of Christianity in Africa began in the middle of the 1st century in Egypt, and by the end of the 2nd century in the region around Carthage. Mark the Evangelist started the Coptic Orthodox Church of Alexandria in about AD 43. Important Africans who influenced the early development of Christianity includes Tertullian, Clement of Alexandria, Origen of Alexandria, Cyprian, Athanasius and Augustine of Hippo. The later rise of Islam in North Africa reduced the size and numbers of Christian congregations, leaving only the Coptic Church in Egypt, the Ethiopian Orthodox Tewahedo Church in the Horn of Africa and the Nubian Church in the Sudan (Nobatia, Makuria and Alodia).
In terms of prosperity and cultural life, the Byzantine Empire was one of the peaks in Christian history and Orthodox civilization, and Constantinople remained the leading city of the Christian world in size, wealth and culture. There was a renewed interest in classical Greek philosophy, as well as an increase in literary output in vernacular Greek. Byzantine art and literature held a pre-eminent place in Europe, and the cultural impact of Byzantine art on the west during this period was enormous and of long lasting significance.
With the decline and fall of the Roman Empire in the west, the papacy became a political player, first visible in Pope Leo's diplomatic dealings with Huns and Vandals. The church also entered into a long period of missionary activity and expansion among the various tribes. While Arianists instituted the death penalty for practicing pagans (see Massacre of Verden as example), Catholicism also spread among the Germanic peoples, the Celtic and Slavic peoples, the Hungarians and the Baltic peoples. Christianity has been an important part of the shaping of Western civilization, at least since the 4th century.
Around 500, St. Benedict set out his Monastic Rule, establishing a system of regulations for the foundation and running of monasteries. Monasticism became a powerful force throughout Europe, and gave rise to many early centers of learning, most famously in Ireland, Scotland and Gaul, contributing to the Carolingian Renaissance of the 9th century.
In the 7th century Muslims conquered Syria (including Jerusalem), North Africa and Spain. Part of the Muslims' success was due to the exhaustion of the Byzantine empire in its decades long conflict with Persia. Beginning in the 8th century, with the rise of Carolingian leaders, the papacy began to find greater political support in the Frankish Kingdom.
The Middle Ages brought about major changes within the church. Pope Gregory the Great dramatically reformed ecclesiastical structure and administration. In the early 8th century, iconoclasm became a divisive issue, when it was sponsored by the Byzantine emperors. The Second Ecumenical Council of Nicaea (787) finally pronounced in favor of icons. In the early 10th century, Western Christian monasticism was further rejuvenated through the leadership of the great Benedictine monastery of Cluny.
Hebraism, like Hellenism, has been an all-important factor in the development of Western Civilization; Judaism, as the precursor of Christianity, has indirectly had much to do with shaping the ideals and morality of western nations since the Christian era.
In the west, from the 11th century onward, older cathedral schools developed into universities (see University of Oxford, University of Paris and University of Bologna.) The traditional medieval universities—evolved from Catholic and Protestant church schools—then established specialized academic structures for properly educating greater numbers of students as professionals. Prof. Walter Rüegg, editor of A History of the University in Europe, reports that universities then only trained students to become clerics, lawyers, civil servants and physicians.
Originally teaching only theology, universities steadily added subjects including medicine, philosophy and law, becoming the direct ancestors of modern institutions of learning. The university is generally regarded as an institution that has its origin in the Medieval Christian setting. Prior to the establishment of universities, European higher education took place for hundreds of years in Christian cathedral schools or monastic schools (Scholae monasticae), in which monks and nuns taught classes; evidence of these immediate forerunners of the later university at many places dates back to the 6th century AD.
Accompanying the rise of the "new towns" throughout Europe, mendicant orders were founded, bringing the consecrated religious life out of the monastery and into the new urban setting. The two principal mendicant movements were the Franciscans and the Dominicans founded by St. Francis and St. Dominic respectively. Both orders made significant contributions to the development of the great universities of Europe. Another new order were the Cistercians, whose large isolated monasteries spearheaded the settlement of former wilderness areas. In this period church building and ecclesiastical architecture reached new heights, culminating in the orders of Romanesque and Gothic architecture and the building of the great European cathedrals.
From 1095 under the pontificate of Urban II, the Crusades were launched. These were a series of military campaigns in the Holy Land and elsewhere, initiated in response to pleas from the Byzantine Emperor Alexios I for aid against Turkish expansion. The Crusades ultimately failed to stifle Islamic aggression and even contributed to Christian enmity with the sacking of Constantinople during the Fourth Crusade.
Over a period stretching from the 7th to the 13th century, the Christian Church underwent gradual alienation, resulting in a schism dividing it into a so-called Latin or Western Christian branch, the Roman Catholic Church, and an Eastern, largely Greek, branch, the Orthodox Church. These two churches disagree on a number of administrative, liturgical and doctrinal issues, most notably papal primacy of jurisdiction. The Second Council of Lyon (1274) and the Council of Florence (1439) attempted to reunite the churches, but in both cases the Eastern Orthodox refused to implement the decisions and the two principal churches remain in schism to the present day. However, the Roman Catholic Church has achieved union with various smaller eastern churches.
Beginning around 1184, following the crusade against the Cathar heresy, various institutions, broadly referred to as the Inquisition, were established with the aim of suppressing heresy and securing religious and doctrinal unity within Christianity through conversion and prosecution.
15th-century Renaissance brought about a renewed interest in ancient and classical learning. Another major schism, the Reformation, resulted in the splintering of the Western Christendom into several branches. Martin Luther in 1517 protested against the sale of indulgences and soon moved on to deny several key points of Roman Catholic doctrine.
Other reformers like Zwingli, Calvin, Knox and Arminius further criticized Roman Catholic teaching and worship. These challenges developed into the movement called Protestantism, which repudiated the primacy of the pope, the role of tradition, the seven sacraments and other doctrines and practices. The Reformation in England began in 1534, when King Henry VIII had himself declared head of the Church of England. Beginning in 1536, the monasteries throughout England, Wales and Ireland were dissolved.
Thomas Müntzer, Andreas Karlstadt and other theologians perceived both the Roman Catholic Church and the confessions of the Magisterial Reformation as corrupted. Their activity brought about the Radical Reformation, which gave birth to various Anabaptist denominations.
Partly in response to the Protestant Reformation, the Roman Catholic Church engaged in a substantial process of reform and renewal, known as the Counter-Reformation or Catholic Reform. The Council of Trent clarified and reasserted Roman Catholic doctrine. During the following centuries, competition between Roman Catholicism and Protestantism became deeply entangled with political struggles among European states.
Meanwhile, the discovery of America by Christopher Columbus in 1492 brought about a new wave of missionary activity. Partly from missionary zeal, but under the impetus of colonial expansion by the European powers, Christianity spread to the Americas, Oceania, East Asia and sub-Saharan Africa.
Throughout Europe, the divides caused by the Reformation led to outbreaks of religious violence and the establishment of separate state churches in Europe. Lutheranism spread into northern, central and eastern parts of present-day Germany, Livonia and Scandinavia. Anglicanism was established in England in 1534. Calvinism and its varieties (such as Presbyterianism) were introduced in Scotland, the Netherlands, Hungary, Switzerland and France. Arminianism gained followers in the Netherlands and Frisia. Ultimately, these differences led to the outbreak of conflicts in which religion played a key factor. The Thirty Years' War, the English Civil War and the French Wars of Religion are prominent examples. These events intensified the Christian debate on persecution and toleration.
In the era known as the Great Divergence, when in the West the Age of Enlightenment and the Scientific revolution brought about great societal changes, Christianity was confronted with various forms of skepticism and with certain modern political ideologies such as versions of socialism and liberalism. Events ranged from mere anti-clericalism to violent outbursts against Christianity such as the Dechristianisation during the French Revolution, the Spanish Civil War and certain Marxist movements, especially the Russian Revolution and the persecution of Christians in the Soviet Union under state atheism.
Especially pressing in Europe was the formation of nation states after the Napoleonic era. In all European countries, different Christian denominations found themselves in competition, to greater or lesser extents, with each other and with the state. Variables are the relative sizes of the denominations and the religious, political and ideological orientation of the state. Urs Altermatt of the University of Fribourg, looking specifically at Catholicisms in Europe, identifies four models for the European nations. In traditionally Catholic countries such as Belgium, Spain and to some extent Austria, religious and national communities are more or less identical. Cultural symbiosis and separation are found in Poland, Ireland and Switzerland, all countries with competing denominations. Competition is found in Germany, the Netherlands and again Switzerland, all countries with minority Catholic populations who to a greater or lesser extent did identify with the nation. Finally, separation between religion (again, specifically Catholicism) and the state is found to a great degree in France and Italy, countries where the state actively opposed itself to the authority of the Catholic Church.
The combined factors of the formation of nation states and ultramontanism, especially in Germany and the Netherlands but also in England (to a much lesser extent), often forced Catholic churches, organizations and believers to choose between the national demands of the state and the authority of the Church, specifically the papacy. This conflict came to a head in the First Vatican Council, and in Germany would lead directly to the Kulturkampf, where liberals and Protestants under the leadership of Bismarck managed to severely restrict Catholic expression and organization.
Christian commitment in Europe dropped as modernity and secularism came into their own in Europe, particularly in the Czech Republic and Estonia, while religious commitments in America have been generally high in comparison to Europe. The late 20th century has shown the shift of Christian adherence to the Third World and southern hemisphere in general, with the western civilization no longer the chief standard bearer of Christianity.
Some Europeans (including diaspora), Indigenous peoples of the Americas and natives of other continents have revived their respective peoples' historical folk religions. Approximately 7.1 to 10% of Arabs are Christians, most prevalent in Egypt, Syria and Lebanon.
With around 2.4 billion adherents, split into three main branches of Catholic, Protestant and Eastern Orthodox, Christianity is the world's largest religion. The Christian share of the world's population has stood at around 33% for the last hundred years, which says that one in three persons on earth are Christians. This masks a major shift in the demographics of Christianity; large increases in the developing world have been accompanied by substantial declines in the developed world, mainly in Europe and North America. According to a 2015 Pew Research Center study, within the next four decades, Christians will remain the world's largest religion; and by 2050, the Christian population is expected to exceed 3 billion.:60
As a percentage of Christians, the Catholic Church and Orthodoxy (both Eastern and Oriental) are declining, while Protestants and other Christians are on the rise. The so-called popular Protestantism[note 4] is one of the fastest growing religious categories in the world.
Christianity is the predominant religion in Europe, the Americas and Southern Africa. In Asia, it is the dominant religion in Georgia, Armenia, East Timor and the Philippines. However, it is declining in many areas including the Northern and Western United States, Oceania (Australia and New Zealand), northern Europe (including Great Britain, Scandinavia and other places), France, Germany, the Canadian provinces of Ontario, British Columbia and Quebec, and parts of Asia (especially the Middle East – due to the Christian emigration, South Korea, Taiwan, and Macau).
The Christian population is not decreasing in Brazil, the Southern United States and the province of Alberta, Canada, but the percentage is decreasing. In countries such as Australia and New Zealand, the Christian population are declining in both numbers and percentage.
Despite the declining numbers, Christianity remains the dominant religion in the Western World, where 70% are Christians. A 2011 Pew Research Center survey found that 76.2% of Europeans, 73.3% in Oceania and about 86.0% in the Americas (90.0% in Latin America and 77.4% in North America) identified themselves as Christians. By 2010 about 157 countries and territories in the world had Christian majorities.
However, there are many charismatic movements that have become well established over large parts of the world, especially Africa, Latin America and Asia. Since 1900, primarily due to conversion, Protestantism has spread rapidly in Africa, Asia, Oceania and Latin America. From 1960 to 2000, the global growth of the number of reported Evangelical Protestants grew three times the world's population rate, and twice that of Islam. St. Mary's University study estimated about 10.2 million Muslim convert to Christianity in 2015. as well a significant numbers of Muslims converts to Christianity in Afghanistan, Albania, Azerbaijan Algeria, Belgium, France, Germany, Iran, India, Indonesia, Malaysia, Morocco, Russia, Netherlands, Saudi Arabia, Tunisia, Turkey, Kazakhstan, Kyrgyzstan, Kosovo, United States, and Central Asia. It is also reported that Christianity is popular among people of different backgrounds in India (mostly Hindus), and Malaysia, Mongolia, Nigeria, Vietnam, Singapore, Indonesia, China, Japan, and South Korea.
In most countries in the developed world, church attendance among people who continue to identify themselves as Christians has been falling over the last few decades. Some sources view this simply as part of a drift away from traditional membership institutions, while others link it to signs of a decline in belief in the importance of religion in general. Europe's Christian population, though in decline, still constitutes the largest geographical component of the religion. According to data from the 2012 European Social Survey, around a third of European Christians say they attend services once a month or more, Conversely about more than two-thirds of Latin American Christians and according to the World Values Survey about 90% of African Christians (in Ghana, Nigeria, Rwanda, South Africa and Zimbabwe) said they attended church regularly.
Christianity, in one form or another, is the sole state religion of the following nations: Argentina (Roman Catholic), Tuvalu (Reformed), Tonga (Methodist), Norway (Lutheran), Costa Rica (Roman Catholic), Kingdom of Denmark (Lutheran), England (Anglican), Georgia (Georgian Orthodox), Greece (Greek Orthodox), Iceland (Lutheran), Liechtenstein (Roman Catholic), Malta (Roman Catholic), Monaco (Roman Catholic), and Vatican City (Roman Catholic).
|Tradition||Followers||% of the Christian population||% of the world population||Follower dynamics||Dynamics in- and outside Christianity|
Nations with Christianity as their state religion are in blue
Nations with Christianity as their state religion (detailed map; see legend for more)
The three primary divisions of Christianity are Roman Catholicism, Eastern Orthodoxy and Protestantism.:14 However, there are other Christian groups that do not fit neatly into one of these primary categories. The Nicene Creed is accepted as authoritative by most Christian denominations, including the Roman Catholic, Eastern Orthodox, Anglican and major Protestant churches.
There is a diversity of doctrines and practices among groups calling themselves Christian. These groups are sometimes classified under denominations, though for theological reasons many groups reject this classification system. A broader distinction that is sometimes drawn is between Eastern Christianity and Western Christianity, which has its origins in the East–West Schism (Great Schism) of the 11th century.
In addition to the Lutheran and Reformed (or Calvinist) branches of the Reformation, there is Anglicanism after the English Reformation. The Anabaptist tradition was largely ostracized by the other Protestant parties at the time, but has achieved a measure of affirmation in more recent history. Adventist, Baptist, Methodist, Pentecostal and other Protestant confessions arose in the following centuries.
As well as these modern divisions, there were many diverse Christian communities with wildly different Christologies, eschatologies, soteriologies and cosmologies that existed alongside the "Early Church" which is itself a projected concept to indicate which communities were "proto-orthodox", in that their views would become dominate. In many ways, the first three centuries of Christianity was significantly more diverse than the modern Church.
The Catholic Church consists of those particular Churches, headed by bishops, in communion with the Pope, the Bishop of Rome, as its highest authority in matters of faith, morality and Church governance. Like Eastern Orthodoxy, the Roman Catholic Church, through apostolic succession, traces its origins to the Christian community founded by Jesus Christ. Catholics maintain that the "one, holy, catholic and apostolic church" founded by Jesus subsists fully in the Roman Catholic Church, but also acknowledges other Christian churches and communities and works towards reconciliation among all Christians. The Catholic faith is detailed in the Catechism of the Catholic Church.
The 2,834 sees are grouped into 24 particular autonomous Churches (the largest of which being the Latin Church), each with its own distinct traditions regarding the liturgy and the administering the sacraments. With more than 1.1 billion baptized members, the Catholic Church is the largest Christian church and represents over half of all Christians as well as one sixth of the world's population.
The Eastern Orthodox Church consists of those churches in communion with the Patriarchal Sees of the East, such as the Ecumenical Patriarch of Constantinople. Like the Roman Catholic Church, the Eastern Orthodox Church also traces its heritage to the foundation of Christianity through apostolic succession and has an episcopal structure, though the autonomy of its component parts is emphasized, and most of them are national churches. A number of conflicts with Western Christianity over questions of doctrine and authority culminated in the Great Schism. Eastern Orthodoxy is the second largest single denomination in Christianity, with an estimated 225–300 million adherents.
The Oriental Orthodox churches (also called "Old Oriental" churches) are those eastern churches that recognize the first three ecumenical councils—Nicaea, Constantinople and Ephesus—but reject the dogmatic definitions of the Council of Chalcedon and instead espouse a Miaphysite christology. The Oriental Orthodox communion consists of six groups: Syriac Orthodox, Coptic Orthodox, Ethiopian Orthodox, Eritrean Orthodox, Malankara Orthodox Syrian Church (India) and Armenian Apostolic churches. These six churches, while being in communion with each other are completely independent hierarchically. These churches are generally not in communion with Eastern Orthodox Churches with whom they are in dialogue for erecting a communion.
The Assyrian Church of the East, with an unbroken patriarchate established in the 17th century, is an independent Eastern Christian denomination which claims continuity from the Church of the East - in parallell to the Catholic patriarchate established in the 16th century that evolved into the Chaldean Catholic Church, an Eastern Catholic church in full communion with the Pope.
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In the 16th century, Martin Luther, and subsequently Huldrych Zwingli and John Calvin, inaugurated what has come to be called Protestantism. Luther's primary theological heirs are known as Lutherans. Zwingli and Calvin's heirs are far broader denominationally, and are broadly referred to as the Reformed tradition. The oldest Protestant groups separated from the Catholic Church in the Protestant Reformation, often followed by further divisions.
In the 18th century, for example, Methodism grew out of Anglican minister John Wesley's evangelical and revival movement. Several Pentecostal and non-denominational churches, which emphasize the cleansing power of the Holy Spirit, in turn grew out of Methodism. Because Methodists, Pentecostals and other evangelicals stress "accepting Jesus as your personal Lord and Savior", which comes from Wesley's emphasis of the New Birth, they often refer to themselves as being born-again.
Estimates of the total number of Protestants are very uncertain, but it seems clear that Protestantism is the second largest major group of Christians after Roman Catholicism in number of followers (although the Eastern Orthodox Church is larger than any single Protestant denomination). Often that number is put at more than 800 million, corresponding to nearly 40% of world's Christians. The majority of Protestants are members of just a handful of denominational families, i.e. Adventists, Anglicans, Baptists, Reformed (Calvinists), Lutherans, Methodists and Pentecostals. Nondenominational, evangelical, charismatic, neo-charismatic, independent and other churches are on the rise, and constitute a significant part of Protestant Christianity.
A special grouping are the Anglican churches descended from the Church of England and organized in the Anglican Communion. Some Anglican churches consider themselves both Protestant and Catholic. Some Anglicans consider their church a branch of the "One Holy Catholic Church" alongside of the Roman Catholic and Eastern Orthodox churches, a concept rejected by the Roman Catholic Church and some Eastern Orthodox.
While Anglicans, Lutherans and the Reformed branches of Protestantism originated in the Magisterial Reformation, other Protestant groups such as the Anabaptists originated in the Radical Reformation and are distinguished by their rejection of infant baptism; they believe in baptism only of adult believers — credobaptism. (Anabaptists are made up mostly of Amish, Mennonites, Hutterites and Schwarzenau Brethren/German Baptist groups.) 
Some groups of individuals who hold basic Protestant tenets identify themselves simply as "Christians" or "born-again Christians". They typically distance themselves from the confessionalism and/or creedalism of other Christian communities by calling themselves "non-denominational" or "evangelical". Often founded by individual pastors, they have little affiliation with historic denominations.
The Second Great Awakening, a period of religious revival that occurred in the United States during the early 1800s, saw the development of a number of unrelated churches. They generally saw themselves as restoring the original church of Jesus Christ rather than reforming one of the existing churches. A common belief held by Restorationists was that the other divisions of Christianity had introduced doctrinal defects into Christianity, which was known as the Great Apostasy. In Asia, Iglesia ni Cristo is a known restorationist religion that was established during the early 1900s.
Some of the churches originating during this period are historically connected to early 19th-century camp meetings in the Midwest and Upstate New York. American Millennialism and Adventism, which arose from Evangelical Protestantism, influenced the Jehovah's Witnesses movement and, as a reaction specifically to William Miller, the Seventh-day Adventists. Others, including the Christian Church (Disciples of Christ), Evangelical Christian Church in Canada, Churches of Christ, and the Christian churches and churches of Christ, have their roots in the contemporaneous Stone-Campbell Restoration Movement, which was centered in Kentucky and Tennessee. Other groups originating in this time period include the Christadelphians and Latter Day Saint movement. While the churches originating in the Second Great Awakening have some superficial similarities, their doctrine and practices vary significantly.
Various smaller Independent Catholic communities, such as the Old Catholic Church, include the word Catholic in their title, and arguably have more or less liturgical practices in common with the Catholic Church, but are no longer in full communion with Holy See.
Esoteric Christians regard Christianity as a mystery religion, and profess the existence and possession of certain esoteric doctrines or practices, hidden from the public but accessible only to a narrow circle of "enlightened", "initiated", or highly educated people. Some of the esoteric Christian institutions include the Rosicrucian Fellowship, the Anthroposophical Society and the Martinism.
Messianic Judaism (or Messianic Movement) is the name of a Christian movement comprising a number of streams, whose members may consider themselves Jewish. The movement originated in the 1960s and 1970s, and it blends elements of religious Jewish practice with evangelical Christianity. Messianic Judaism affirms Christian creeds such as the messiahship and divinity of "Yeshua" (the Hebrew name of Jesus) and the Triune Nature of God, while also adhering to some Jewish dietary laws and customs.
Western culture, throughout most of its history, has been nearly equivalent to Christian culture, and a large portion of the population of the Western hemisphere can be described as cultural Christians. The notion of "Europe" and the "Western World" has been intimately connected with the concept of "Christianity and Christendom" many even attribute Christianity for being the link that created a unified European identity.
Though Western culture contained several polytheistic religions during its early years under the Greek and Roman empires, as the centralized Roman power waned, the dominance of the Catholic Church was the only consistent force in Europe. Until the Age of Enlightenment, Christian culture guided the course of philosophy, literature, art, music and science. Christian disciplines of the respective arts have subsequently developed into Christian philosophy, Christian art, Christian music, Christian literature etc.
Christianity has had a significant impact on education as the church created the bases of the Western system of education, and was the sponsor of founding universities in the Western world; as the university is generally regarded as an institution that has its origin in the Medieval Christian setting. Historically, Christianity has often been a patron of science and medicine. It has been prolific in the foundation of schools, universities and hospitals, and many Catholic clergy; Jesuits in particular, have been active in the sciences throughout history and have made significant contributions to the development of science. Protestantism also has had an important influence on science. According to the Merton Thesis, there was a positive correlation between the rise of English Puritanism and German Pietism on the one hand and early experimental science on the other. The Civilizing influence of Christianity includes social welfare, founding hospitals, economics (as the Protestant work ethic), politics, architecture, literature, personal hygiene, and family life.
Eastern Christians (particularly Nestorian Christians) contributed to the Arab Islamic Civilization during the reign of the Ummayad and the Abbasid by translating works of Greek philosophers to Syriac and afterwards to Arabic. They also excelled in philosophy, science, theology and medicine. And many scholars of the House of Wisdom were of Christian background.
Christians have made a myriad of contributions to human progress in a broad and diverse range of fields, including philosophy, science and technology, fine arts and architecture, politics, literatures, music, and business. According to 100 Years of Nobel Prizes a review of Nobel prizes award between 1901 and 2000 reveals that (65.4%) of Nobel Prizes Laureates, have identified Christianity in its various forms as their religious preference.
Postchristianity is the term for the decline of Christianity, particularly in Europe, Canada, Australia and to a minor degree the Southern Cone, in the 20th and 21st centuries, considered in terms of postmodernism. It refers to the loss of Christianity's monopoly on values and world view in historically Christian societies.
Cultural Christians are secular people with a Christian heritage who may not believe in the religious claims of Christianity, but who retain an affinity for the popular culture, art, music and so on related to it. Another frequent application of the term is to distinguish political groups in areas of mixed religious backgrounds.
Christian groups and denominations have long expressed ideals of being reconciled, and in the 20th century, Christian ecumenism advanced in two ways. One way was greater cooperation between groups, such as the World Evangelical Alliance founded in 1846 in London or the Edinburgh Missionary Conference of Protestants in 1910, the Justice, Peace and Creation Commission of the World Council of Churches founded in 1948 by Protestant and Orthodox churches, and similar national councils like the National Council of Churches in Australia which includes Roman Catholics.
The other way was institutional union with United and uniting churches, a practice that can be traced back to unions between Lutherans and Calvinists in early 19th-century Germany. Congregationalist, Methodist and Presbyterian churches united in 1925 to form the United Church of Canada, and in 1977 to form the Uniting Church in Australia. The Church of South India was formed in 1947 by the union of Anglican, Baptist, Methodist, Congregationalist and Presbyterian churches.
The ecumenical, monastic Taizé Community is notable for being composed of more than one hundred brothers from Protestant and Catholic traditions. The community emphasizes the reconciliation of all denominations and its main church, located in Taizé, Saône-et-Loire, France, is named the "Church of Reconciliation". The community is internationally known, attracting over 100,000 young pilgrims annually.
Steps towards reconciliation on a global level were taken in 1965 by the Roman Catholic and Orthodox churches mutually revoking the excommunications that marked their Great Schism in 1054; the Anglican Roman Catholic International Commission (ARCIC) working towards full communion between those churches since 1970; and some Lutheran and Roman Catholic churches signing the Joint Declaration on the Doctrine of Justification in 1999 to address conflicts at the root of the Protestant Reformation. In 2006, the World Methodist Council, representing all Methodist denominations, adopted the declaration.
Criticism of Christianity and Christians goes back to the Apostolic Age, with the New Testament recording friction between the followers of Jesus and the Pharisees and scribes (e.g. Matthew 15:1-20 and Mark 7:1–23). In the 2nd century, Christianity was criticized by the Jews on various grounds, e.g. that the prophecies of the Hebrew Bible could not have been fulfilled by Jesus, given that he did not have a successful life. Additionally a sacrifice to remove sins in advance, for everyone or as a human being, did not fit to the Jewish sacrifice ritual, furthermore God is said to judge people on their deeds instead of their beliefs. One of the first comprehensive attacks on Christianity came from the Greek philosopher Celsus, who wrote The True Word, a polemic criticizing Christians as being unprofitable members of society.
By the 3rd century, criticism of Christianity had mounted, partly as a defense against it. Wild rumors about Christians were widely circulated, claiming that they were atheists and that, as part of their rituals, they devoured human infants and engaged in incestuous orgies. The Neoplatonist philosopher Porphyry wrote the fifteen-volume Adversus Christianos as a comprehensive attack on Christianity, in part building on the pre-Christian concepts of Plotinus.
By the 12th century, the Mishneh Torah (i.e., Rabbi Moses Maimonides) was criticizing Christianity on the grounds of idol worship, in that Christians attributed divinity to Jesus who had a physical body. In the 19th century, Nietzsche began to write a series of polemics on the "unnatural" teachings of Christianity (e.g. sexual abstinence), and continued his criticism of Christianity to the end of his life. In the 20th century, the philosopher Bertrand Russell expressed his criticism of Christianity in Why I Am Not a Christian, formulating his rejection of Christianity in the setting of logical arguments.
Criticism of Christianity continues to date, e.g. Jewish and Muslim theologians criticize the doctrine of the Trinity held by most Christians, stating that this doctrine in effect assumes that there are three Gods, running against the basic tenet of monotheism. New Testament scholar Robert M. Price has outlined the possibility that some Bible stories are based partly on myth in "The Christ Myth Theory and its problems".
Christian apologetics aims to present a rational basis for Christianity. The word "apologetic" comes from the Greek word "apologeomai", meaning "in defense of". Christian apologetics has taken many forms over the centuries, starting with Paul the Apostle. The philosopher Thomas Aquinas presented five arguments for God's existence in the Summa Theologica, while his Summa contra Gentiles was a major apologetic work. Another famous apologist, G. K. Chesterton, wrote in the early twentieth century about the benefits of religion and, specifically, Christianity. Famous for his use of paradox, Chesterton explained that while Christianity had the most mysteries, it was the most practical religion. He pointed to the advance of Christian civilizations as proof of its practicality. The physicist and priest John Polkinghorne, in his Questions of Truth discusses the subject of religion and science, a topic that other Christian apologists such as Ravi Zacharias, John Lennox and William Lane Craig have engaged, with the latter two men opining that the inflationary Big Bang model is evidence for the existence of God.
The enthusiasm for evangelization among the Christians was also accompanied by the awareness that the most immediate problem to solve was how to serve the huge number of new converts. Simatupang said, if the number of the Christians were double or triple, then the number of the ministers should also be doubled or tripled and the tole of the laity should be maximized and Christian service to society through schools, universities, hospitals and orphanages, should be increased. In addition, for him the Christian mission should be involved in the struggle for justice amid the process of modernization.
Theologians, bishops, and preachers urged the Christian community to be as compassionate as their God was, reiterating that creation was for all of humanity. They also accepted and developed the identification of Christ with the poor and the requisite Christian duty to the poor. Religious congregations and individual charismatic leaders promoted the development of a number of helping institutions-hospitals, hospices for pilgrims, orphanages, shelters for unwed mothers-that laid the foundation for the modern "large network of hospitals, orphanages and schools, to serve the poor and society at large."
In the central provinces of India they established schools, orphanages, hospitals, and churches, and spread the gospel message in zenanas.
Many of these Christian groups, of course, refuse to consider other such groups Christian.
Hence all the power of magic became dissolved; and every bond of wickedness was destroyed, men's ignorance was taken away, and the old kingdom abolished God Himself appearing in the form of a man, for the renewal of eternal life.— St. Ignatius of Antioch in Letter to the Ephesians, ch.4, shorter version, Roberts-Donaldson translation
We have also as a Physician the Lord our God Jesus the Christ the only-begotten Son and Word, before time began, but who afterwards became also man, of Mary the virgin. For 'the Word was made flesh.' Being incorporeal, He was in the body; being impassible, He was in a passable body; being immortal, He was in a mortal body; being life, He became subject to corruption, that He might free our souls from death and corruption, and heal them, and might restore them to health, when they were diseased with ungodliness and wicked lusts— St. Ignatius of Antioch in Letter to the Ephesians, ch.7, shorter version, Roberts-Donaldson translation
The Church, though dispersed throughout the whole world, even to the ends of the earth, has received from the apostles and their disciples this faith: ...one God, the Father Almighty, Maker of heaven, and earth, and the sea, and all things that are in them; and in one Christ Jesus, the Son of God, who became incarnate for our salvation; and in the Holy Spirit, who proclaimed through the prophets the dispensations of God, and the advents, and the birth from a virgin, and the passion, and the resurrection from the dead, and the ascension into heaven in the flesh of the beloved Christ Jesus, our Lord, and His manifestation from heaven in the glory of the Father 'to gather all things in one,' and to raise up anew all flesh of the whole human race, in order that to Christ Jesus, our Lord, and God, and Savior, and King, according to the will of the invisible Father, 'every knee should bow, of things in heaven, and things in earth, and things under the earth, and that every tongue should confess; to him, and that He should execute just judgment towards all...
For, in the name of God, the Father and Lord of the universe, and of our Savior Jesus Christ, and of the Holy Spirit, they then receive the washing with water
Armenia is considered the first nation to have adopted Christianity as the state religion in a traditional date of c. A.D. 301.
Forced Conversion under Atheistic Regimes: It might be added that the most modern example of forced "conversions" came not from any theocratic state, but from a professedly atheist government — that of the Soviet Union under the Communists.
For example, Messianic Jews, without exception, believe that the way to eternal life is through the acceptance of Jesus as one's personal savior and that no obedience to the Jewish law or "works" is necessary in order to obtain that goal.…Remarkably, it has been exactly this adherence to the basic Christian evangelical faith that has allowed Messianic Jews to adopt and promote Jewish rites and customs. They are Christians in good standing and can retain whatever cultural attributes and rites they choose.
Nor is the agreement conincidental, according to a substantial constituency of religious apologists, who regard the inflationary Big Bang model as direct evidence for God. John Lennox, a mathematician at the University of Oxford, tells us that 'even if the non-believers don't like it, the Big Bang fits in exactly with the Christian narrative of creation'. ... William Lane Craig is another who claims that the Biblical account is corroborated by Big Bang cosmology. Lane Craig also claims that there is a prior proof that there is a God who created this universe.
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