But if everyone DID become a Muslim, they wouldn’t know what to do then.
Maybe Dick Cheney would make a good Caliph, with Karl Rove as Grand Vizier....
Sure they would. It would be Shi'ite against Sunni. Each little sect bombing the other "infidels". Islam is not a homogeneous set of beliefs. Infidels include all non-muslims and all non-believers in your chosen sect.