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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Probably Islam if for no other reason than it is the slowest to become "modernized". This being a majority taking a more moderate approach to it and not following strict rules, and no, I am not assuming Islam is all Sharia Law. But just as Protestantism and Catholicism once were I'd say a larger percent of Islamists are extremists than with Christian ones even if only slightly. I of course have no evidence to prove this statistic so feel free to prove me wrong.