Thanks for your responses thus far.
OTWO - you have some very interesting and valuable comments in your posts. I guess the issue is that I don't know the person in question. All I know is that he is 18 years old and very devout. From my experience 18 is one of those ages where you are beginning to test the waters. Here in Australia, 18 is when you are allowed to start buying alchohol etc. I like the What do you think expression too. It's got an underlying thought to it - I'm asking you to think for yourself here! I really appreciate all your thoughts and I am going to relay these back to my friend. (and any others that are posted). I think they are a wonderful start.
I'm not trying to make a clean sweep of it, I want to just start the ball rolling as inconspiculously as possible...