Book excerpt: A study not of the institution of the Church but of Christianity itself, this book explores the Christian people, their beliefs, and their way of life, providing a new understanding of Western Christianity at the time of the Reformation. Bossy begins with a systematic exposition of traditional or pre-Reformation Christianity, exploring the forces that tended to undermine it, the characteristics of the Protestant and Catholic regimes that superseded it, and the fall-out that resulted from its disintegration.