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i think this would be a cool feature, where if u unite all norse u can convert slavic trbes etc
is this ever a possibility?

As in sending missionaries to pagan rulers? Someone more experienced might be able to answer that.

Reforming a pagan faith doesn't necessarily mean uniting the faith, though.
 
i think that exists... you may have to be feudal. i'm not really certain, it worked for me, having reformed norse converting slavic and old norse.