"—Laws about heresy are one of the things that's really different between Andoran and Cheliax. In Andoran it's illegal to deliberately serve the Evil gods, or other powers of the lower planes, or to proselytize for them, but that's basically the only thing that's illegal heresy. —There's some extra rules involved if you're trying to publish anything, or give a big public speech or something, but they don't apply to things you're just thinking, or that you're saying to your friends or family or anything.
Apart from that, the main things countries other than Cheliax call heresy are saying things about the gods that aren't true, or saying things that are true, but that make the gods that are popular in those countries look bad, or that would make people not want to serve those gods, or sometimes if they make the gods look good but make the people in charge of the country look bad — usually they call that last one some other crime but I think Taldor sometimes calls it heresy. But — if someone in Andoran's saying things about the gods that aren't true, and it's not because they're proselytizing, it's probably because they're confused, and they're probably confused because of how Cheliax used to lie to everyone. And it'd be better if they weren't confused, but it's not their fault that Cheliax lied all the time. And then lots of countries think it should be illegal to say true things if they make Iomedae or Sarenrae or whoever is the most popular god look bad, but in Andoran people mostly think that's stupid, and I think so too.
And so then — the laws we have about religion aren't special, you don't need to go to any sort of church to report them, you can just tell the town watch like it was any other crime. Uh, there are some priests who work for the watch, but they aren't a separate thing. Like, in the cities they pay Abadarans to cast Abadar's Truthtelling — uh, that's a special kind of truth spell that only Abadarans can cast — and then there's also some paladins who've sworn a bunch of specific oaths about how much they'll tell the watch about what you tell them, and so on, but you don't need a priest of Iomedae to tell you that someone who's going around saying 'everyone should worship Asmodeus' is proselytizing for Asmodeus."