Saying religion requires it is like saying decency requires it. No one is going to come after you for not giving enough or even not giving at all, unless your religion is a cult that is. Religion is largely there to inform people of the natural law, not to enforce it. The nice thing about the natural law is that it is self-enforcing. If you don't want to run a foul of it, it is nice to have some guides. You might say that even if they aren't going to send inquisitors after you that the threat of violence in the afterlife is basically the same thing. Using psychological harm to enforce compliance. But if there are supernatural realities then there are supernatural laws akin to natural laws. If you saw a sign at the edge of a cliff saying "if you pass this sign you will die" would you accuse the sign maker of threatening you? Death is simply a natural consequence of sudden deceleration. Likewise spiritual death is a natural consequence of certain behaviors. Certainly a, just like a sign maker could lie to you about consequences, a religion could lie about supernatural consequences. But the reason the lie works is because it is adjacent to the truth.

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What’s the difference between a religion and a cult besides the perception that one is legitimate because of large following? The reason the lie works is because the ones who disagreed were killed. Religions didn’t spread peacefully.
I'd amend that to "Religions don't always spread peacefully" because the vast majority of Christian conversions were peaceful. For the first 300 years it was join AND die not join or die. Contrary to what most believe, after Constantine legalized it, there weren't any forced conversions. Most of the empire including Constantine himself did not convert. Even after the Emperors were Christian they still coexisted peacefully with pagans and the number in significant government positions roughly reflected the population demographics. That isn't to say that there haven't been horrors, but to say Christianity has spread mainly through violence is ahistorical.
Well cult can mean a few things. It can just mean a particular religious devotion, so sure large religions can be cults. But here I'd associate it with certain psychological techniques to keep people in line. - shunning those who leave. - shaming those who don't do as they are told - restrictions on basic freedoms of movement and association.