I'm certainly no expert, but from what I remember, it's basically just a tiny following (just that village), and the "religion" was founded by Ri'Bassa's grandfather. His grandfather prophesied that the end of the world would come after three signs; I'm not even certain I would consider that a religion, because it's just a prophecy about the end times, and does not include an object of worship/appeasemant, such as a god. That's about it, but there could be more; I'm just going off what I remember Ri'Bassa telling me, and he may not have told the whole story. They could very well worship their own god, or a Khajiit god, or one of the Divines-- I have no idea.