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Just to balance the World without Islam. What would happen if Christianity just got lost in the morass of religions perculating in the Roman Empire. I can't see any major changes in survivability of WRE and ERE or the "Barbarian" invasions of same. However could Islam still arise or at least a very close analogue, with just the Judaic tradition to draw upon? Also if ERE and Persia still wore each other out as in OTL would it burst on the scene and be even more successful?
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