Everybody needs a "from whence have we come" narrative and God used Moses to codify what He'd already established in His people through oral tradition. The question of what beast of burden Abram used after called from Ur was not, at least in my view, important to the post-Exodus people of God.
Nor was the specific method God used in creating the world ex nihilo. The important thing was Abram answered the call, and God was faithful to Him... As He would be to them... In faithful & faithlessness. Same w/ creation. God made the world and everything in it. Whether He used evolution or not didn't matter to those people and I don't think it should matter to us.
Oh well... Whatcha gonna do? Haters gonna hate...
