World War Two - 25 percent of the SS were practicing Catholics.

From 1929 until the regime's collapse in 1945, the SS was the foremost agency of security, surveillance, and terror within Germany and German-occupied Europe.

“Believers are supposed to hold that the pope is the vicar of Christ on earth, and the keeper of the keys of Saint Peter. They are of course free to believe this, and to believe that god decides when to end the tenure of one pope or (more important) to inaugurate the tenure of another. This would involve believing in the death of an anti-Nazi pope, and the accession of a pro-Nazi one, as a matter of divine will, a few months before Hitler’s invasion of Poland and the opening of the Second World War. Studying that war, one can perhaps accept that 25 percent of the SS were practicing Catholics and that no Catholic was ever even threatened with excommunication for participating in war crimes. (Joseph Goebbels was excommunicated, but that was earlier on, and he had after all brought it on himself for the offense of marrying a Protestant.) Human beings and institutions are imperfect, to be sure. But there could be no clearer or more vivid proof that holy institutions are man-made.”

― Christopher Hitchens, God is Not Great: How Religion Poisons Everything