If Germany had won the war, Hitler and the Nazi movement would have turned their attention to the next on their list. The first to go would have been all those Generals with the “vons” in their names, since they would no longer be needed. Then the Business Class, since their job helping to build the war machine was done. And then they would have gone after Christianity with the same fervor as they did the Jews.
It was going to be a Thousand Year Reich. Within a couple of generations, any vestiges of Christianity would have been wiped out in the Nazi-dominated areas, had they won the war.