MagisterCultuum
Great Sage
Sort of. Cassiel himself is very tolerant of those who want the freedom to worship as they see fit without forcing their views on others, but a lot of Grigori commoners are recent refugees from theocracies and tend to be extremely suspicious of anyone religious. There is no legal ramification for personal piety, but in many Grigori communities your neighbors may not fully embrace you until you've spent a few nights getting wasted in the local tavern while blaspheming every deity imaginable. (Heavy drinking is very common among the Grigori. It is implied that even Cassiel may be an alcoholic.)The grigori as a nation are very religiously tolerant. Perhaps the most (well, other than Kuriotates or Dural, of course). The only thing they are not tolerant of is having a "state" religion. So building large public temples, or having a mandatory religion tax/ tithing would be rather prohibited. However, individual or loosely organized group worship would be completely tolerated. And, I suppose that if a community became rich enough to build a temple with their own money, as long as they didn't feel compelled to lord some level of power over their neighbors, it would be tolerated.
The vast majority of the Grigori are distrustful of the Luonnatar and don't really want them around, despite knowing they haven't done nearly enough for their laws to allow doing anything to stop them.
In addition to not giving public support to religions, I believe that the Grigori tend to prosecute those who use fear of divine punishment to scare people into giving donations. Selling indulgences would get one arrested for fraud. Calling for the persecution of those of other faiths would get one arrested for disturbing the peace and inciting violence.
The Grigori aren't the sort to do anything with mandatory taxes, much less support a religious establishment. They tend to be fairly extreme libertarians in that regard. They are an aristocracy rather than a democracy, but their aristocrats have no special privileges. They can keep the appointment for life (although I suspect that petitions could force bad leaders to resign), but it is never hereditary. The local lords are often chosen by lot from among the most average citizens, although yeoman farmers are definitely preferred over city folk. Cassiel does not like merchants, as he thinks most of them secretly serve Mammon, and suspects that elections would make campaign contributions too important for corrupt merchants not to take over. The lords do not get a house or an income, so they need to work a regular job in additions to having the added responsibilities of acting as justices of the peace and militia leaders. They spend a lot of time running fundraisers and asking for donations. I imagine there are a lot of bake sales. The Grigori do not approve of conscription, and their soldiers tend to go AWOL a lot. Local lords likely spend a lot of time in taverns trying to convince their troops that they should show up for training (and actual battles) more often. They really don't have the logistics to wage offensive wars, but are pretty good at resisting foreign occupation.