This is a controversial and important new examination of the origins of Christian mission, set against the background of ancient Judaism and the pagan culture of the Roman Empire. The author invites a total reconsideration of the grounds for religious conversion in both Christianity and Judaism. He suggests that mission was not inherent to either early Judaism or Christianity, and was only sporadically practiced in antiquity by these religions. Clear, accessible, and displaying considerable scholarship, this book will provide an important challenge and a stimulus to both theologians and historians.