I think I have misread this or it might be a mistake by a media person (both equaly likely) but what if the cradle of Serbian religion really was in Kosovo? Are we talking about a Serbian Jesus or a "heathen" religion in the middle of Europe.
The medieval Serbian state, which has absolutely nothing to do with modern Serbia, had a somewhat more southerly center of gravity. There are several old monasteries in Kosovo, but I think the "holiness" of the site is related to the Battle of Kosovo in which Serbian statehood was extinguished by the overwhelming Ottoman victory. There's sort of a martyr thing going on there. Weirdly, Kosovo wasn't part of Serbia all that long, nor is it the place of origin of the Serbian state, although once they had it the capital was usually there, and it was one of the richer areas of the kingdom.
A lot of the attitude is just manufactured national myth, like just about everything else that is important to anyone anywhere these days.