This work investigates the fundamental transformation of Christian identity and social practice in Western Europe during the transition from the late medieval period through the Reformation era. John Bossy, a noted historian of early modern Catholicism, utilizes a sociological and anthropological framework to move beyond institutional ecclesiastical history. He argues that the Reformation represented a shift from a communal, traditional religious life to a more individualized, confessionalized experience that redefined the relationship between the believer and the church.

Historians frequently cite this text as a foundational work for understanding the social history of the Reformation. Scholars often note the analytical depth of Bossy's approach, which remains a standard reference for those studying the transition of religious culture in early modern Europe.