Obviously actions and history are going to make a difference to specific religions and their growth. Would Enweil be refounding their faith had Qyrvaggism not started their policy of RTO's? Or had the faith not had such a strong association with Riombara?
I'm not sure if they would have founded it again were it not for qyrvaggism, Riombara or not. They might have been content with atheist, but as with most people, they would not have tolerated any faith from an unfriendly realm showing up. Likely, not any faith at all except a select few trusted ones from friendly people and places.