This book shows that a reformation isn't possible. In Christianity, the passages where God commands the Jews to war against their enemies are considered in the context of that era. In Islam, it is herasy to relegate any passage from the Koran as not applicable to today. To become devout in Islam, the Koran will always lead back to militancy.
More precicely, there are no OT passages giving a general command to kill. God told specific people to kill specific foes for specific reasons. As such, these passages are perfectly useful today. They show how angry God was about those particular sins (infanticide, ritual sex abuse, occult practices, et al.)