A very timely question. I'm just finishing a book titled "The Evolution of God" by Robert Wright. Highly recommended.
He went through the history of the God of Abraham and it was extremely insightful. He talks about how perceptions of God changed as things changed 'on the ground', in other words, the world of the authors. He examined Hebrew, Christian, and Muslim theological history, much of which I didn't know.
I think his view of God is not too far from my own. He says God is natural moral force that evolved by natural selection as man evolved from his ape ancestors. God is the morality and understanding we needed to survived in our societies as they developed. He sees Paul as the proponent of 'Universal Love' that was very a rare philosophy in the ancient world. It is an idea he sees as a way forward so disparate religions can, if not merge, at least respect and live at peace with all the others. (I'm sure I'm not doing Wright justice as I skipped summarizing his points on game theory.)