German Catholics were one-third of the population of the Reich, and of that number about a fourth were more than nominal, or cultural Catholics. Even in the ‘30s, practicing Catholics tended to be a distinct minority. Catholics were not supposed to be Party members, but many did join.
Ridiculous, you say? It happens all around here, all the time. One Catholic saying "once Catholic, always Catholic", and another saying "the Church needs to excommunicate that person behaving badly". And another begging everyone to just "come back home to the Church". All the while, evil just grows and grows.