If you could erase one religion from ever existing, which would it be? That means nobody will ever be that religion or know about that religion, and all religious actions in the past by members of that religion will go away (Example: If you vote Christianity, the Crusades never would have happened. If you vote Islam, 9/11 never would have happened).
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Hard to say: Without Christianity, I'd have several friends who would presumably be atheist instead. That would be nice. But then without Islam, a lot of modern wars and acts of terror wouldn't have happened.