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Sumerian religion is the mythology, pantheon, rites, and cosmology of the Sumerian civilization. Mesopotamian mythology as a whole, surviving in the mythologies and religions of the Hurrians, Akkadians, Babylonians, Assyrians, and other culture groups.
Sumerian myths were passed down through the oral tradition until the invention of writing. Early Sumerian cuneiform was used primarily as a record-keeping tool; it was not until the late early dynastic period that religious writings first became prevalent as temple praise hymns  and as a form of "incantation" called the nam-šub (prefix + "to cast").
In the Sumerian city-states, temple complexes originally were small, elevated one-room structures. In the early dynastic period, temples developed raised terraces and multiple rooms. Toward the end of the Sumerian civilization, Ziggurats became the preferred temple structure for Mesopotamian religious centers. Temples served as cultural, religious, and political headquarters until approximately 2500 BCE, with the rise of military kings known as Lu-gals (“man” + “big”)  after which time the political and military leadership was often housed in separate "palace" complexes.
Until the advent of the Lugals, Sumerian city states were under a virtually-complete theocratic government controlled by independent groups of En, or high priests. Priests were responsible for continuing the cultural and religious traditions of their city-state, and were viewed as mediators between humans and the cosmic and terrestrial forces. The priesthood resided full-time in temple complexes, and administered to matters of state including the large irrigation processes necessary for the civilization’s survival.
The Sumerians envisioned the universe as a closed dome surrounded by a primordial saltwater sea. Underneath the terrestrial earth, which formed the base of the dome, existed an underworld and a freshwater ocean called the Apsû. The deity of the dome-shaped firmament was named An; the earth was named Ki. First the underground world was believed to be an extension of the goddess Ki, but later developed into the concept of Kigal. The primordial saltwater sea was named Nammu, who became known as Tiamat during and after the Sumerian Renaissance.
According to Sumerian mythology, the gods originally created humans as servants for themselves, but freed them when they became too much to handle.
The primordial union of An and Ki produced Enlil, who became leader of the Sumerian pantheon. After the other deities banished Enlil from Dilmun (the “home of the deities”) for raping the air goddess Ninlil, Ninlil had a child: Nanna, god of the moon. Nanna and Ningal gave birth to Inanna, the goddess of war and fertility, and to Utu, god of the sun.
The Sumerians originally practiced a polytheistic religion, with anthropomorphic deities representing cosmic and terrestrial forces in their world. During the middle of the third millennium BCE, Sumerian deities became more anthropocentric and were "...nature gods transformed into city gods." Deities such as Enki and Inanna were viewed as having been assigned their rank, power, and knowledge from An, the heaven deity, or Enlil, head of the Sumerian pantheon.
This cosmological shift may have been caused by the growing influence of the neighboring Akkadian religion, or as a result of increased warfare between the Sumerian city-states; the assignment of certain powers to deities may have mirrored the appointment of the Lugals, who were given power and authority by the city-state and its priesthood.
The earliest historical records of Sumer do not go back much further than ca. 2900 BC, although it is generally agreed that Sumerian civilization started between ca. 4500 and 4000 BC. The earliest Sumerian literature of the 3rd millennium BC identifies four primary deities; Anu, Enlil, Ninhursag and Enki. The highest order of these earliest gods were described occasionally behaving mischievously towards each other, but were generally involved in co-operative creative ordering.
The majority of Sumerian deities belonged to a classification called the Anunna (“[offspring] of An”), whereas seven deities, including Enlil and Inanna, belonged to a group of “underworld judges" known as the Anunnaki (“[offspring] of An” + Ki). During the Third Dynasty of Ur, the Sumerian pantheon was said to include sixty times sixty (3600) deities.
The main Sumerian deities are:
The Sumerians experienced an ongoing linguistic and cultural exchange with the Semitic Akkadian peoples in northern Mesopotamia for generations prior to the usurpation of their territories by Sargon of Akkad in 2340 BCE. Sumerian mythology and religious practices were rapidly integrated into Akkadian culture, presumably blending with the original Akkadian belief systems that have been mostly lost to history. Sumerian deities developed Akkadian counterparts. Some remained virtually the same until later Babylonian and Assyrian rule. The Sumerian god An, for example, developed the Akkadian counterpart Anu; the Sumerian god Enki became Ea; and the Sumerian gods Ninurta and Enlil remained very much the same in the Akkadian pantheon.
The Amorite Babylonians gained dominance over southern Mesopotamia by the mid-seventeenth century BCE. During the Old Babylonian Period, the Sumerian and Akkadian languages were retained for religious purposes; the majority of Sumerian mythological literature known to historians today comes from the Old Babylonian Period, either in the form of transcribed Sumerian texts (most notably the Babylonian version of the Epic of Gilgamesh) or in the form of Sumerian and Akkadian influences within Babylonian mythological literature (most notably the Enûma Eliš). The Sumerian-Akkadian pantheon was altered, most notably with the introduction of a new supreme deity, Marduk. The Sumerian goddess Inanna also developed the counterpart Ishtar during the Old Babylonian Period.
The Hurrians adopted the Akkadian god Anu into their pantheon sometime no later than 1200 BCE. Other Akkadian deities adapted into the Hurrian pantheon include Ayas, the Hurrian counterpart to Ea; Shaushka, the Hurrian counterpart to Ishtar; and the goddess Ninlil, whose mythos had been drastically expanded by the Babylonians.
Some stories in Sumerian religion appear similar to stories in other Middle-Eastern religions. For example, in the Epic of Gilgamesh, the biblical account of Noah and the flood myth resembles some aspects of the Sumerian deluge myth. The Judaic underworld Sheol is very similar in description with the Sumerian and Babylonian Kigal, ruled by the goddess Ereshkigal and in the Babylonian religion, with their introduced consort, the death god Nergal. Sumerian scholar Samuel Noah Kramer noted similarities between many Sumerian and Akkadian "proverbs" and the later Hebrew proverbs, many of which are featured in the Book of Proverbs.
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