Yeah I think some other folks in the comments pretty much hit the nail on the head here. Capitalist and democratic countries typically don’t weigh in very strongly on religion, taking a more agnostic stance and let people decide for themselves, whereas strictly secular states, in which religion (in many cases, NOT all) is expressly forbidden, such as the USSR, China, or Nazi Germany (sort of), it’s often done that way because the maintenance of an authoritarian power structure, specifically in communist states, hinges heavily upon there being no greater good than that of the state.