It can't be true... no...
Yes, we can RP within the faith. There is no notice board on religion hall saying do not RP here
That said, I am curious which realm the new player eventually picks
Well there are two options really. If Oligarch stays alive only Garas and Catherine will leave and then I don't know.
If Oligarch gets destroyed, then all 15 nobles will head to Perdan and prepare for war, perhaps 14 or so with 1 or 2 inactive.