Polytheists in the Bible

So, I was reading a book today and the authors contention was that Abram in the bible was a polytheist, and the result of God speaking to him over his lifetime is that he became a monotheist. I think this is an interesting point because altogether too often when I read about his life in relation to Sarah, Isaac, and God, I see him as a monotheist just like myself. I think that when we consider that he might have been a polytheist just like every of Sumerian living at that time, we begin to see why it makes sense what God does for and through him. God, by the birth of Isaac and the almost sacrifice of Isaac seems to be demonstrating that not only does he control the other gods, but that he in fact is the only God. He demonstrates that he controls the cycles of life (which multiple gods were said to control) through the birth of Isaac at an old age, and he shows that he controls and regulates what and who gets sacrificed (there were a lot of different things to sacrifice to certain gods) through the almost sacrifice of his only son; Isaac. I think this is an interesting point, that i must research further...that is all for now.
- Milnik