Book excerpt: Around the world people are leaving Islam for Christianity in unprecedented numbers. This book seeks to look into the world of some of these converts, trying to discern the shape of their newfound faith. Why do they convert? What challenges do they face? And ultimately, what do they in their own complex and sometimes difficult circumstances claim to have understood about God that, while in Islam, they had not? In other words, what is the content of their contextual theology? In seeking to answer these questions, Miller looks into the world of an unintentional church plant in the Arab world consisting of believers from a Muslim background, visits with groups of Iranian converts in the diaspora, and examines the written testimonies of still other converts. In a world where Muslim-Christian relations are increasingly important and sometimes tendentious, this book examines the lived faith and contextual theology of people who have chosen to leave Islam and embrace Christianity.