I don’t know much about the Holocaust vis a vis Catholics. Did Hitler target them?
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Hitler generally left Catholics and Lutherans alone— UNLESS they opposed him. Then he went after them with a vengeance. Truth is, many Lutherans and Catholics in Germany and beyond in Europe (and even in the United States) supported Hitler — initially. Look up pictures of several Catholic Bishops doing the classic Nazi salute on Google for instance.
BUt that does NOT represent the whole of the story — it’s much more complex than that. And many were just apathetic at the start, only growing opposed and active against Hitler as his atrocities grew more obvious and alarming. Read about Martin Neimuller and Dietrich Bonhoeffer for examples of this.
Some facts ... Facts are the best antidote to ignorance.