Thorough and meticulously researched, this study is based on a comprehensive reading of philosophical arguments drawn from all the major Jewish sources, published and unpublished, from the Geonic period in the ninth century until the dawn of the Haskalah in the late eighteenth century. The core of the book is a detailed discussion of the four doctrines of Christianity whose rationality Jews thought they could definitively refute: trinity, incarnation, transubstantiation, and virgin birth. In each case, Daniel Lasker presents a succinct history of the Christian doctrine and then proceeds to a...