WI: Islamic Constantinople, Francia, and Italy

ITTL lets say that Kallinikos invents Greek Fire for the Arabs, resulting in the first siege of Constantinople succeeding. Constantine IV and everyone in line to succeed him die in that battle, resulting in the Empire shattering into dozens of states which are then swallowed up by the Arabs. The Ecumenical Patriarch of Constantinople converts to Islam and denounces Christianity. Eventually, the former ERE breaks away from the Abbasid Caliphate and becomes a Shia Greek Caliphate.

Meanwhile, the Muslims decisively win at Tours in 732 (I know this battle might not actually be that important, but let's just assume the Franks fall). The Franks are resistant to the Muslims, which results in many uprises which are crushed brutally and decisively and silencing the local Christians for centuries.

Before the Abbasid Revolution, The Umayyads launch an invasion of Italy both by sea from the Eastern Mediterranean and by land through Northern Italy. The invasion is successful and the Pope is allowed to live and continue religious activities as long as he stays out of secular diplomacy and affairs besides discouraging Christian revolt. However, a future Pope abandons Rome and flees to Wessex.

After the establishment of the Abbasid Caliphate, the Umayyads retain control of Iberia, Frankia, and Italy. Islam of this area slowly diverges into its own form of Islam; Messianic Islam, which holds Jesus in high regard and is very focused on the worship of Muhammad himself, and alcohol and pork bannings in the Quran are ignored. There is also higher focus on personal sin and devotion to God/Allah.

So, what do you think happens next? Will the British Isles remain Christian? How long will it take for the pagans to convert to Islam?
What would have hapoened , if there was a major nomadic attack from Asia during the early stage of Islamic conquest ?
 
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