By David Carlin, The Catholic Thing - These progressive folks have the long and instructive history of liberal Protestantism lying before them – if only they would take the trouble to look at it. Once you begin, motivated by a desire to modernize your religion, dropping this or that ancient Christian doctrine, soon the entire structure of Christian faith and morals begins to collapse. And as it collapses, many church members who desire true Christianity, or something very close to it, abandon their now-heretical church.