SciDad - If you have already agreed on transparency, please do it. It's not healthy for you to be wondering. You need to get this out in the open, for both of you. If you're wondering, you'll be drawing back - you just can't help it after being burned.
Getting involved with church is an excellent idea. The happiest period in our M life was when we were both involved. We had different things to do, mutual and separate friend, and a common goal.
I should have been more suspicious when he informed me a few years back that he wasn't interested in doing any "churchy" things. But - that's hindsight. I'm beginning to understand that hindsight, while crystal clear, is pretty much a waste of brain power I should be devoting to something else once I've learned the lesson there. LOL