This business of Hitler being a Catholic is a silly one. Yes, he was baptised and a part of a dysfunctional family. By the time he began to rant about the Jews, wrote Mein Kampf, etc., he was well known as an agnostic and very much against everything Catholic & or Christian. He was deeply into occult practices and outright satanism.
Hitler was NOT a Catholic. He abandoned everything the Catholic Church stood for. This is why some of the first victims were the Catholic clergy and the monasteries of Germany.
After his years in a Catholic school and being an altar boy? Whats the old saying “once a Catholic always a Catholic “( except of course if you are a mass murderer, then we do not want to claim you, but we still will not excommunicate you just in case )