TheKillerBs
Maester
Become powerful enough and the emperor will be bending over backwards to keep you happy and out of factions even if you're an infidel. At least it works for me as the Zoroastrian Duke of Tabriz in the 769 start. If you have Monks and Mystics (I think it's that one, anyway) you can falsely convert to Sunni and create a secret Catholic society and turn the Umayyads into Christians from within.I'm more worried about religious revocation of titles by the Umayyad ruler than anything if I should swear fealty. But like I said, in my games the Carolingians usually fracture themselves to hell and over the top of the world, so its me and the Celts in Brittany who goes to fight the Umayyads.
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