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I think it's perfectly possible for that to be the case for a few hundred years. I think long term you'll likely see conversions to Christianity anyway.
I'm perhaps overly pessimistic on this but Christian missionary work was pretty good even outside the Roman Empire. The Rus were never ruled within those borders, the Scandinavians weren't, the Irish weren't, the poles weren't, etc. etc..
Empires with a strong religious doctrine tended to spread that doctrine into neighbours which lacked that, see Islam in Africa and Central Asia as another good example of this. Generally the merchants would be converted first, then the nobility and then the peasantry.
I'm perhaps overly pessimistic on this but Christian missionary work was pretty good even outside the Roman Empire. The Rus were never ruled within those borders, the Scandinavians weren't, the Irish weren't, the poles weren't, etc. etc..
Empires with a strong religious doctrine tended to spread that doctrine into neighbours which lacked that, see Islam in Africa and Central Asia as another good example of this. Generally the merchants would be converted first, then the nobility and then the peasantry.