DBWI: No Muhammad?

What if Muhammad did not convert most Arabs to Manichaeism? Would an Arab empire still have spread from the Atlantic to the Indus? What religion would the Arabs have followed without Manichaeism?
 
What if Muhammad did not convert most Arabs to Manichaeism? Would an Arab empire still have spread from the Atlantic to the Indus? What religion would the Arabs have followed without Manichaeism?

Certainly not. If either Muhammad just didn't exist or no one ended up believing in his God, then I can imagine the Byzantines and Sassanids alive much longer. Byzantines could've retaken Italy proper and maybe even Hispania. We could see a continuation of the former powers of Antiquity battling it out in the so called 'Dark Ages'
 
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