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To answer @OP's original question, I don't think it's possible for Muslims to establish a world Caliphate. The West and East have superior military technology. The best they can hope for is establish a Caliphate in parts of the middle east but they have warring factions [Sunnis and Shias] who'll be battling each other forever and before they unite [that's highly unlikely] there'll be no Caliphate anywhere.