It’s fair for Umberto Eco to single it out.

There is a huge difference between Nazis putting Christian ministers in positions of power and Hitler calling himself a Christian warrior and Soviets wiping religion out except for a short period when Stalin reopened the church during WW2. Eco stated the discredited idea that Nazis weren’t Christians.

https://encyclopedia.ushmm.org/content/en/article/the-german-churches-and-the-nazi-state