In this first in-depth and wide-ranging history of Christian conversion, David Kling examines the dynamic of turning to the Christian faith by individuals, families, and people groups. Global in reach and engaging recent methods and theories in conversion studies, the narrative progresses from early Christian beginnings in the Roman world to Christianity's expansion into Europe, the Americas, China, India, and Africa. Although conversion is often associated with a particular strand of modern Christianity (evangelical) and a particular type of experience (sudden, overwhelming), when examined over two millennia, it emerges as a phenomenon far more complex than any one-dimensional profile would suggest.