The Catholic Church and Nazi Germany did not get along very well. The Nazis were a political and military group in Germany during World War II that wanted to control the whole world. They did not like the Catholic Church because the Church was a large, influential group and some people thought the Church was against the Nazis.
The Nazis also believed that the Catholic Church was too powerful and was a threat to the Nazi beliefs. So, the Nazi government tried to control the Catholic Church by making laws that would make it more difficult for the Church to do its work. These laws included things such as closing Catholic schools and universities, banning certain religious holidays, stopping the Church from organizing public events, and forbidding people from wearing religious symbols like crosses.
The German people were divided between Catholics and those who supported the Nazi government. When World War II ended in 1945, the Catholic Church and the Nazi government ended their conflict.