I can relate to this. I'm only spiritual/religious when I'm going into psychosis. Normal me is an atheist, so its an odd thing to experience. I didn't notice the connection for a long time, I just figured sometimes spirituality makes more sense to me than others, but that wasn't the case. Now that I know it's a symptom of my mania/psychosis starting, I can usually stop it before it gets out of control just by realizing what's happening.

I'm not sure what to tell you in terms of how to deal with how it is for you since you've grown up with religion (and I'm assuming you still believe it) other than try to distinguish when your beliefs become more extreme, such as fearing turning into a monster, being possessed, etc.