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.