I'm not convinced the absence of small religinos will spurt the growth of large religions. Not at all.
Take Eretzism and Enweil, for example. Not too long ago, the faith died because all the priests had left/paused, turning all of Enweil pagan. Qyrvagg priests were in the meanwhile converting regions, though, and using RTOs (regardless of Eretzism or not). Will Enweil adopt Qyrvaggism because Eretzism died? Obviously not, they just had someone found the faith again.
I believe that the less faiths you have, the more atheist realms you will have, where all preaching is forbidden.
Because, after all, financial success has absolutely nothing to do with a religion being interesting or not. And it's easier to finance a single-realm religion than a multi-realm one, especially if they are going to be taxed. The strongest faiths will remain while others die out, but that doesn't mean they'll be stronger themselves. I predict they will be weaker, and their strength will only come from the lack of religions being able to label them as evil. Which, in itself, isn't that much considering it's not a requirement for arrests.
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?
