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If you kind of merge the religions prophecies basically the end times point to nuclear war and then everyone at some point coming together and being like wtf are we doing. As njh mentioned, nuclear war might just be the first big domino to drop in wiping us out. God is the only common denominator we have that makes us brothers with people in Africa say. The only way the world can survive is If it's one. Obviously that's not feasible in today's world but in a hypothetical scenario Gods way of ruling is the only system I see that works.