Questions About Membership in the Church To the man who reads twentieth-century theological literature at all perceptively, it becomes more and more apparent that the central area of interest to the writers of our time is and has been the science of ecclesiology. And, within the area of the tractatus de ecclesia, there is one essential point which is and has been at issue. It is the teaching that the Roman Catholic Church, the religious organization over which the Bishop of Rome presides, is actually the one and only supernatural kingdom of God on earth, the one and only institution...