How would a majority hellenic or germanic europe interact with an islamic middle east

Imagine christianity was replaced by germanic religion or hellenism. They were just as unified, everything was the same except the god(s) they worshipped. How would the interact with islamic spain and the middle east.
 
My guess is that european paganism would evolve in a similar direction than hinduism and would have similar relations with islamic empires, specially one that expand into europe. Also christian minorities would be enthusiastic fellow travellers of muslim conquests and governments.
 
More hostile. They are not people of the book and didn't have prestige of Roman, so Muslims would be far more aggressive, constant raiding would make hostile relation.
 
Without the prestige Christianity had in Arabia, Islam wouldn’t exist- and for that to happen it needs to be the state religion of the eastern Roman Empire. I’m very skeptical of Greco Roman religion surviving in the western government when the east is as solidly Christian as OTL. Perhaps all you have is the Germans not becoming Christian and you get the same result, but Greco Roman paganism, with its intimate ties to the state could not survive when the state itself becomes Christian. When this does happen, you’d probably get the Caliphate trying to support Christian revolts among whatever Christian communities remained in the west and convert them to Islam
 
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