Given you mentioned Marx, the Soviet Russia he has a hand in creating is still a theocracy. Just replace Yahweh with Stalin. Same thing.

That's why I don't argue for any kind of religion or some non-existent generic one world religion - I argue for Christianity specifically and I believe other religions don't worship the true God and are false and demonic. The Marxist regime was proudly scientific and atheistic and I know that from personal experience because I live in a former Eastern Bloc country where atheism and dialectical materialism was state sanctioned and everyone was brainwashed into it.

Every regime is theological in nature - you can't escape religious and ritualistic behavior. I think we all saw that during the coof medical fascism which I'd say is as secular as it gets. What, you think you don't have faith the same way a religious person has? Atheism (which almost always is rank materialism, naive empiricism and scientism) is very much a religion too and holds assumptions about the world that are based on pure faith. Worse - it is constantly contradicting itself because it appeals to universal laws and principles like laws of physics, logic, morals, truth, meaning without being able to justify any of it. There is no good or bad in the materialist worldview. There is no truth and falsehood. Things just are and they came to be for no purpose at all - everything, including your thoughts are practically meaningless and the process of random atoms bumping into each other. So why should we care about anything at all if your worldview is the case?