In the book of Genesis, Terah, Abraham's father, along with Abraham and Lot made a journey from the city of Ur to Canaan. To answer these questions, let's develop some background on the city of Ur. Ur was one of the twelve cities. It survived through the Babylonian times into Terah's time. In Sumerian mythology each city had a patron god.
Sumerian mythology is ancient.
This time estimate is highly uncertain because the astronomical and carbon dating observations are so sketchy. If we accept this time estimate, we can conclude that historically speaking, the Sumerian myths are as far away from the time of Moses as we are from the time of Moses. Many of the Sumerian myths are inferred from cuneiform tablets. Our interpretation of these writings is no doubt less certain than our interpretation of modern writing or greek manuscripts of the gospel about Jesus Christ. In spite of these uncertainties, these texts give us a faint clue of what people believed so many years ago.