This book explores the challenge posed by the immersion of 15 million Muslims in Western democracies and the few, but volatile, terrorists present within the larger body of believers. The fact that immersion is insufficient to stem the tide of extremism is discussed, along with the factors that contribute to the growth of radical Islam, such as the presence of charismatic, authoritarian leadership, educational options that downplay critical thinking, and colonialism. Hope that radical Islam can be kept to a minimum in Western societies is provided by the Islamic concept of Ijtihad, through which Muslims reinterpret their own religion. Just as mainstream Mormons have dispensed with polygamy and Christians with witch-hunting, Muslims in Western societies have the potential to minimize the growth of radicalism.