This is an edited version of the sixth Catherwood Lecture in Public Theology delivered by David Smith on 24 October 2002 in Belfast. David W. Smith is Lecturer in Urban Mission and World Christianity at the International Christian College, Glasgow. He was formerly Co-director of the Whitefield Institute, Oxford, and Principal of Northumbria Bible College. He is the author of Mission After Christendom, Crying in the Wilderness: Evangelicalism and Mission in Today’s Culture, Transforming the World? The Social Impact of British Evangelicalism, and Against the Stream: Christianity and Mission in an Age of Globalization.