Transforming Faith Communities argues for a model of being church that combines congregationalism with a constructive approach to church-state relationships. Congregationalism within a vision for a renewed Christendom is commended here as a viable option for Christian mission in the twenty-first-century world. In making this case, two movements are explored–those inspired by sixteenth-century Anabaptism and late twentieth-century Latin American liberation theology. Each movement is held up as a mirror to the other. A continuing vision for the transformation of church and society emerges from this book as a number of contemporary resonances begin to sound. These include an outline of some likely common features in the development of radical religious communities, an examination of some of the factors that create world-affirming Christian faith communities, and many examples of effective and constructive engagement with church and society across the centuries.