I think Spirituality and a Belief in religion should be a individual practice.. I believe people get a lot more out of it. Mine has always been that way, although I do sometimes go to church, it is a nice one that doesn't force anything. The Pastor is more of a story teller than a fear mongering screamer...
Anyway, back to your situation:
You should HONESTLY think about telling your mother about how you felt. That you felt completely uncomfortable and taken advantage of.. The reason I say this, is because your mother may want to keep having you go to her friend for various reasons. Especially if she thinks it did you a world of good.. and you may end up resenting your mother. Assure her that you're a well rounded man - you seem to be. Remind her that you've made good decisions in the past and that you don't need the inconvenience the friend has caused you. She may understand, she may not, but it still needs to be told. I wouldn't want to be subjected to something like that - especially, a fraud and a liar. I have no use for people like that.
Good luck!