Double standards. It's okay for you to morally equate atheism with tyrannical, genocidal totalitarianism (the Chinese gov't/Stalinist Russian governments were athiests) and unfair for someone to equate far-right anti-Semitic Nationalism (Hitler was an exaggerater of Lutheran anti-Semitism) with Christianity, then you infer Marxism (different in many, many ways to Stalinism or Leninism or Chinese totalitarianism) is 'bad' and atheist, therefore atheism is bad.
Come on, man.
I never said the atheists were all tyrannical or that tyranny is specific only to atheists. That's what you said. I said the communists are atheists. Atheism is a central tenet of communism. The early CCP and USSR governments were indeed atheistic and their goal to establish a borderless, classless, stateless, and atheistic society. You have to consider Marxism because Marxism is the foundation of Communism, literally Karl Marx invented communism as we know it for which Leninism, Maosim, etc. all are based from. Mind you we don't have to worry too much about them in our time given that they either had to morph or be consigned to history's scrapheap before you and I were born.
Hitler wasn't an atheist, Hitler weren't a Christian either. The Nazis were massively New Ager pagans that is very well documented if it was not outwardly apparant enough. Just look at their old footage with them carrying around swastikas and even the SS runes on their jackets. Lol probably my favorite story is how the highest rank nazi captured during the war, Rudolf Hess (the same whom Hitler dictated Mein Kampf to), was even captured cause he was a little too far into that astrology bunk. This is all well documented stuff, it ain't no secret.
If you want to fairly examine the subject of Christianity and Empire just look at your own nation, Britain. That be a fair equivalency as the British monarch has thought themself head of the Church of England for the past few centuries running. British history is full of intriguing stuff really, not all of it pretty either.