Uh, whether he successfully implemented Communism is irrelevant. Those people who died died for Communism.

Regardless of your false assertions about tge Dark Ages, which are patently so, People do dumb thing in the name of all ideologies or doctrines.

What if your Congress thought sea levels were going to rise 20 in a decade? Or thought that killing all the academics was needed for the proletariat? Nobody is taking about establishing a state church, we are talking about things loke Christmas Trees and "Under God" in a voluntary pledge. If you think those things will cause a governmental collapse, you are silly.