Is there a subplot where Erica can join Santhora's Temple in some capacity? That would be really fun. It could run like working at the brothel, only instead of getting money, she can get boosts to her stats and special healing spells and stuff.
You can be part of a small event at the temple, but you can't properly join it. At this point it's not in the cards (I am trying to finish the game), but perhaps in the future if there is an interest for a 1.1 update, maybe we can revisit this idea.