The nazis are made the bogeyman of the age because they were opposed to the Jews and Communists and history was written by the victors.
About the treatment of the Church, they say that some priests were treated badly and even killed, but one thing I learned in my limited experience with historical revisionism was that during the time of World War II many Catholics from countries such as Spain and Ireland and even France, enlisted into the German army with Catholic priests as chaplains and they saw the fight against the Russian Communists as a sort of holy Crusade against the manifestation of evil that was Communism. So there are two sides to tell. But I am no expert on history, I don't trust mainstream history or anything I ever learned in public school or saw on TV. But that is also a bias. When the mainstream opposes someone in politics I wonder why and think, perhaps he is hated because he was really good. People like Petain and Franco and even Hitler.
Perhaps the nazis were no angels, but if the Holocaust is a lie (and I don't know enough to say that it is. I once heard that even David Irving said that many Jews were killed, even over a million, but not six million.), I see them as just another government (and when you look closely often it seems that all governments are horrible). So they killed a few hundred priests? We killed hundreds of thousands of civilians intentionally with firebombings and nuclear holocausts and we call ourselves the angels and the heroes and the nazis evil?
So the Nazis are evil because they have socialist in their name and were socialists? Every government of the age and all the advanced states now have a o lot of elements of socialism. And here I thought Hitler was evil because he turned Jews into soap and lampshades, but now I learn he was evil because he taxed the rich and gave to the poor and had state control over parts of the economy.