“THE history of Christianity in every age shows how alien to Christ is the heresy of indifferentism [the belief that all religions are paths to God], which was first popularized by the English Deists and the French Rationalists of the seventeenth century. In the first three centuries the Christian martyrs died by the thousands, rather than save their lives by a profession of indifferentism. Frequently they were asked by friends and kinsfolk to sacrifice to the gods of pagan Rome, or at least to allow their names to be written down as having sacrificed. “What difference does it make?” asked their pagan friends. They answered in the words of Christ: “Every one, therefore, that shall confess Me before men, I will confess him before My Father who is in heaven. But he that shall deny Me before men, I will also deny him before My Father who is in heaven” (Matt. x. 32, 33). They were not indifferentists. In sixteenth century England, many a Catholic was offered money, preferment and life, if he would but acknowledge the royal supremacy of the Tudors in things spiritual, against the constant voice of Christendom from the beginning. But men like Blessed Thomas More, Bishop Fisher and Edmund Campion gladly died for the certain teaching of Christ. They were not indifferentists.
“As a matter of fact, we find that the man who says first, “It does not make any difference what a man BELIEVES” is led logically to say, “It does not make any difference what a man DOES.” His morality is built upon the shifting, sands of opinion, fancy, human respect, and, therefore, will not stand the stress of sorrow, disgrace, difficulty or temptation. If religion be a mere matter of opinion, all certainty in morals becomes impossible, and men lapse into the old-time vices of paganism.
“Sometimes the good lives of unbelievers are mentioned as proof positive that belief is an unimportant factor in the regulation of conduct. A man will argue, “A never puts his foot inside a church, nor does he accept any creed whatever; yet he is a man, kindly, charitable, pure and honest. On the other hand, B is a Catholic, accepting without question every dogma and law of his Church, and I know him to be a drunkard, an adulterer, a hypocrite, the most uncharitable and contemptible of men.” But this statement proves nothing at all, because the comparison is made between the open, well-known vices of a sinful, hypocritical believer, and the obvious good deeds of an amiable unbeliever. The whole character of the two men is often not adequately known, and consequently is not weighed in a true balance.”
— “Indifferentism, the Heresy that All Religions are Equal,” by Rev. Bertrand L. Conway, C.S.P, 1929