I've been playing a game right up until now as Revelationist Kentucky->Uppland (latest Github build) and didn't get any crash when checking the Religion tab or the religious sites (which are often the cause of the crashes).
That aside, I recently conquered a near Knox. A Atomicist revival spread from there and I converted to it. It's WAD that I can't reform this faith?
I played a Tenesi--> Uppland game and I was able to reform the Revelationist faith. I haven't had any crashes with the religion tab as a Revelationist but something is wonky for the localization of Revelationist vassal bishops in the religion tab only.
Other random thoughts:
1) I am fine with the New York area being Evangelical. The Evangelical faith is more interesting if it isn't a south only religion.
2) It might add more flavor to the Evangelical faith if there are Raj of India style doctrinal traits. I think even if Protestantism united there would still be a lot of disagreement about baptism. Immersionists would support baptism from immersion like current day Baptists while Affusionists believe in the pouring or sprinkling of water during a Baptism.
3) Maybe a compromise for the Thelemic religion is that the Thelemics are a persecuted minority in 28th century Britain (we would be purposely vague about what the majority faith would be). Thus the Thelemic invasion is kind of a dark occultist repeat of the Puritan migration to America.
4) A syncretic mix of Native American/First Nation religions and Christianity would be interesting for certain regions. But I understand not want to have a Lux Invicta number of different religions.
5) A trade unionist heresy of Rust Cultists that drew on the history of the Knights of Labor, IWW, and AFL would be amazing. Theologically they could oppose private ownership of pre-Event artifacts so pious Union heretics would donate all their finds to tech-priests.