4 stars? I thoroughly enjoyed the history of this book, but it wasn't as good as Zealot. Aslan is a great historian and I enjoy his ideas and arguments, but when he occasionally deviated from history into science/human psychology his foundation clearly was not as firm. This was a great attempt at a very long and broad history, but I was left... Wanting more? A more solid conclusion? Even more, diverse religious history and examples? Im not exactly sure what is wanting from this book, but I still learned a lot and it was fascinating!