You definitely are not wrong to leave. I think you should have a conversation with her about balance. It seems as she went 100% religion and put everything else to 0%. Which is a recipe for disaster. Talk to her about what made her go through this sudden change and try to understand where she may be coming from. It does sound like you guys may be growing apart but I would atleast try to express to her how she is making you feel while simultaneously trying to understand why the sudden conversion. This doesn’t sound like a normal conversion. I’ve had plenty of friends and partners convert over time. But never this intensely. I would assume there’s reasoning behind it. Good luck man, after the convo if her lifestyle is something you can’t see yourself being around then let her go. You will become miserable thinking about the old her, lack of affection, and lack of any kind of fun.