Religious Characters In A Story - The Balance?

When you have characters that come from a religious background in a story, how far should you go in describing their background and avoid coming off preachy?

My character in Open Your Heart was raised LDS, he's gone pretty well inactive because he doesn't feel comfortable at meetings anymore, however, he still believes in everything, and his parents are still very active.

At some point there will be a confrontation between him and his parents, and his parents are going to seek advice from their bishop. I'm pretty sure actually showing the scene with the bishop would be too much, but how do I draw the line with the confrontation, and latter reconciliation, between giving enough religion for context, but not too much religion that it begins to feel preachy?

I've also got Drew's own head to deal with. At some point he's going to have to take a good hard look at what he believes in and come to terms with what it means for him. How do I show this, without detailing it so much, that it ends up coming off preachy?

Plenty of time for this to be hashed out, we've got quite a lot more chapters before it's likely to start coming up.