I’m an atheist but I think we should respect people’s religious beliefs. If someone is a good socialist then it shouldn’t matter if they are religious or not, being anti-religious will only make religious people avoid socialism for no real reason, we don’t get anything by being anti-religious.
I mean, of course we shouldn’t let religious institutions have power as they are usually quite reactionary, but the religious beliefs of people should be respected in my opinion.
The undemocratic dissolution of the Soviet Union seems to be visible in the graph, on the World line.