Given the setup of tMP, and what we know so far about Aetheris Pyrism a religious war seems unlikely. It is entirely possible that the Path of the Gods Sect may rattle their sabres, but then they seem to think tMP has some sort of right to be the only religion in the Lurian area.
Same thought here. While I would OoC welcome the thrill a religious war would bring, I see only Ramiel of the Path of the Gods interested in such event, and the Manifest Path and Aetheris Pyrism blend quite well together, in my opinion. While Aetheris Pryism is more spiritual/ethereal/personal-oriented (at least for now), the Manifest Path is much more material/economic/politic-oriented.