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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Zoroastrianism, basically one of the oldest religions in existence and the base for pretty much all of modern religion nowadays. That way, we wouldn't have to deal with "omg christianity/islam is better" on a daily basis. Why Hinduism and Buddhism are up there in polls, I will never know.