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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Both of those are incorrect. There were more than religious reasons behind the Christian Crusades and 9/11, or terrorist attacks in general. There are disputes over territory, disputes over who should have what resource, who is the superior culture, etc. Getting rid of the concept of God isn't going to do jack diddly squat to stop people from killing each other and being stupid. If you truly believe that religion is the world's scourge, then I'm sorry, but you clearly massively underestimate Human stupidity.