WI - Umayyad Caliphate takes Constantinople

What if the Umayyad Caliphate had been able to seize Constantinople?

There were a couple sieges around the 7th and 8th centuries. During the 670s and during the 710s to be exact, the First and Second sieges of Constantinople. What if one those had actually succeeded, and that the invading forces had been able to hold it? What Point of Divergence do you think would lead to such a series of events?

How would an early Sultanate centered on Greece and Anatolia develop? Would they adopt Arabic language, or have a distinctly Greco-Roman identity like the Persians after their Islamization? Would they stay Sunni or eventually adopt another denomination like Shia? How would they handle future Turkish invasions, provided they still went as OTL? Would the Rus, if it still exists, still adopt Christianity? How about the rest of the Slavic world? How does this affect the rest of Europe?
 
How would an early Sultanate centered on Greece and Anatolia develop?
As the Umayyad would want a villa/*palace In Constantinople and a lot of Syriacs still remember being opressed by the Greeks,a lot of colonist would be jundist from Medina and Syria.
 
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