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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None of them. As much as people hate to believe it, people will kill if they want to regardless of if they have a religion or not. Let people believe what they want to and be "Tolerant" as it is ironically called nowadays.