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Mesopotamian religion, beliefs and practices of the Sumerians and Akkadians, and their successors, the Babylonians and Assyrians, who inhabited ancient Mesopotamia (now in Iraq) in the millennia before the Christian era. These religious beliefs and practices form a single stream of tradition. Sumerian in origin, Mesopotamian religion was added to and subtly modified by the Akkadians (Semites who emigrated into Mesopotamia from the west at the end of the 4th millennium bce), whose own beliefs...