We are living in a time in which we are seeing a rapid unravelling of institutional structures in Western society and a re-alignment of values. The church is not faring well in this process. This book takes the form of an earthed and practical theology and asks the question 'what is the church?' Rather than a purely theoretical, or a purely pragmatic approach, it looks to the radical Reformers of the sixteenth century and finds there an emphasis on the church's invisible realities and on community both of which have a relevance to the twenty-first century.