The greatest conflicts in history have been caused by this very failure on the part of the leaders of the various religious groups. Certainly some of the men who led armies to the Holy Land during the Crusades did so out of a sense of duty to preserve Christian relics from desecration by heathens, but at the same time many were drawn to the Holy Land to capture the wealth of Asia, and many were younger sons of European landholders whose holdings could no longer be divided to heirs and remain productive. Eventually there came an age of enlightenment. Men began to think and to study for themselves. They came to question the doctrines of the church, to challenge dogma with reason.
History shows a gradual opening up of men's minds beginning in the fifteenth century.
First the Church in England broke away from the government of the Pope in Rome. Then others began to think and to question. Luther, Calvin, and Wesley made their contribution. As refreshing as all this was, it was still men's ideas substituting for Christ's own teachings. In their own way, each of the doctrines developed during the Reformation is reasonable.