The separation of church and state is necessary partly because if religion is good then the state shouldn't interfere with the religious vision or with the religious prophet. There must be a realm of truth beyond political competence, that's why there must be a separation of churches, but if religion is bad and a bad religion is one that gives an ultimate sanctity to some particular cause. Then religion mustn't interfere with the state - so one of the basic Democratic principles as we know it in America is the separation of church and state.
Reinhold NiebuhrThe fence and the boundary line are the symbols of the spirit of justice. They set the limits upon each man's interest to prevent one from taking advantage of the other.
Reinhold NiebuhrWe ought to really at least recognize the common predicament of Communists and democrats - or Americans, whatever.
Reinhold Niebuhr