The whole island looks down on Sorraine because they've earned it. The realm's population, whether be it by law or not is irrelevant, is openly hostile to the other faiths of the island. That is public perception. The CoS is the only religion on the FEI that doesn't play nice with everyone else. Nobody else closes down or sacks temples, uses their religion to attempt to undermine governments, uses secular wars as an excuse to go burning temples, etc etc.
Or butchers the followers of other religions in cold blood, Ozrat when the remaining Adgharin were slaughtered.
