The Evolution of God
A book receiving some really good press lately is The Evolution of God by Robert Wright. The author follows the history of religion from polytheism to monolatry (worship of one god among many) to monotheism, focusing primarily on the evolving vision of God in the Hebrew Bible, the New Testament and the Qur'an, ending with a discussion of religion's place in human evolution. Focusing mostly on scriptures, he avoids the more philosophical territory covered in Karen Armstrong's History of God and The Great Transformation. Here is a website with excerpts from the book chapters as well as a video with the author talking about his purpose in writing this book.