WI: Fatimids vs Ilkhanate?

If the Fatimids had survived until the Ilkhanate, and were as capable as the Mamluks, how would the relations between Sunnis and Shias change?
 
If the Fatimids had survived until the Ilkhanate, and were as capable as the Mamluks, how would the relations between Sunnis and Shias change?

How can the Fatimids become as capable as the Mamluks? Their military ethos didn't actually lend itself to stability...
 
How can the Fatimids become as capable as the Mamluks? Their military ethos didn't actually lend itself to stability...
Suppose that they reformed and evolved their military into something like the Ayyubids, and with the organizational aspects of the Mamluks but with the upper class being the Berber cavalry instead of Mamluks.
 
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