A lot of things happen on birthdays. I'm surprised they didn't implement it on Julius' birthday. lol
Again, the Nazis hated Christians but still they needed the support of Christians and Catholics, so they modeled a lot of things from the Catholic way of doing things and tried to bring in the protestants too. Hitler kept Pius XII close until the end, to the point the Catholic ratlines helped escaping nazis. No different than Obama claiming to be Christian, Hitler used the same strategy.