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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Technically if you erased one you could possibly make the world go crazy if you mean today and now but the history stays but if you mean completely then the whole world would be and look different