Sumerian gods were based on what?

Under the four creator deities were the seven gods who "decree the fates." These were An, Enlil, Enki, Ninhursag, Nanna, Utu, and Inanna. These were followed by the 50 "great gods" or Annunaki, the children of An. Sumerians believed that their role in the universe was to serve the gods. And its also believed they are non human but extra terrestrial

He was the oldest god in the Sumerian pantheon, and part of a triad including Enlil, god of the sky and Enki, god of water. He was called Anu by the Akkadians, rulers of Mesopotamia after the conquest of Sumer in 2334 BCE by King Sargon of Akkad.