You would have to consider when the Hebrews, or Isrealites, actually came into being, which would have been after these "pagan" cultures were already established in Egypt, the Chaldees, Greece, etc. and had developed many of their myths. Consider that Abraham came from the Ur of the Chaldees, which was a thriving culture long before the Isrealites became as numberless as the stars.
One thing about that, though, is that he left Ur and went to Haran, where he stayed some years with his mothers relatives. Remember that the Hebrews have always (as far as we know) figured descent as from the mother.