Really glad to see you are enjoying your introduction to the game.
This thread lists many good teaching alliances:
https://forum.smallgiantgames.com/t/teaching-alliances/39771
In terms of your request for a specific type of alliance, I have not seen any alliances that discriminate membership based on any kind of belief or doctrine and I would be very cautious if they did.
Some alliances do enjoy a little bawdy conversation, so if you are concerned about that kind of content, I would request something like a ‘family friendly’ alliance.
Many of us have a personal faith or political persuasion, but this forum and game are probably not the right space for that debate.
All the best on your journey.