Zealot, by Resa Azlan & The first muslim, by Lesley Hazleton
These are (unauthorised, of course) biographies of Jesus of Nazareth and the prophet Muhammad. Both are must-reads if one wishes to understand anything about "the order of things" in this world. Both are very entertaining and easy to read too.
Regarding the biographies themselves: very little is known about Jesus' life, while plenty is known about Muhammad's life. What little is known about Jesus' life, though, suffices to give evidence that many of the myths are historically false. On the other hand, Muhammad had his first revelation aged 40, and had many successes at the battlefield afterwards. What I found particularly appalling of Muhammad's life is the role of women in his life and society, who were treated as goods (especially the fact that he married 9 wives as a means to establish allegiances - after Khadija died).
Overall I find religion a fascinating topic, for various reasons. One is that I understand it could have offered solutions a few centuries ago, but not now, with all the wonderful knowledge we have. Two, because of the huge influence of these stories - we see signs of them all over the place. And three, because religion has been used as a form of oppression throughout time and space.
(Lesley Hazleton has a follow-up book, called "After the prophet", about the Shia - Sunni split. Very recommendable too).