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I think you are refering to Babylonians because Abrahamwas supposed to have lived between 2000 and 1500 while Ur was annihilated in 2004. Not to mention that Abraham is a kind of a fictional character only known through the Bible.

From Encarta:
Sumerian Religion, religious beliefs of the peoples of ancient Sumer. The Sumerians believed that the universe was ruled by a pantheon comprising a group of living beings, human in form, but immortal and possessing superhuman powers. These beings, they believed, were invisible to mortal eyes and guided and controlled the cosmos in accordance with well-laid plans and duly prescribed laws.
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