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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Removing one would severely change the population. Your ancestors may have met each other through their religion. Even a two second change in the past could later which sperm makes it. Removing one will likely kill you.