First, excellent work! That is awesome that you are so well versed in your Faith!
Second, tread lightly. Your friend must work with and through his parents, before anything (as mentioned above).
Third, by way of warning–do not expect to be welcome in his house, after he discusses this with his parents. I could be mistaken here (certainly hope I am…), but that’s probably the least of the blowback you can expect.
By way of e.g.–when I was a senior in HS, I was accepted to the big state U. Our arch rival, was the other (second) big state U. (Without disclosing my location, think Aalabama Auburn, Texas Texas A&M, UF-FSU, USC UCLA…). I had a friend who was a booster of ‘the other’ big state U. I would pick him up often to go out and…do things–the kind of things kids do in HS–they’d welcome me in their house, and treat me like family. When his parents learned that I was going to U. of X [X =big state]–they did not take it well. One day i showed up to pick my friend up, and he met me in the driveway–and told me ‘sorry, but your no longer welcome in this house, since you’re going to U of X–per my parents’.
…and he proceeded to hop in my car, and off we went…
I asked him if he was serious, and he chuckled, and said “…as a heartattack”. And reitierated a few more times…
To this day, I have never seen them again (friend yes; his parents, no). And to this day, I find their behavior to be embarrasingly, pathetically, immature, but…
…I guess that’s life.
…and as serious as we take CFB around these parts…matters of Faith are taken signifcantly more so.
I certainly hope your experience with your friend’s parents goes better than my experience with my friend’s parents…but I share this with you simply as a matter of precedent by analogy–so that you won’t be shocked, if you find yourself ostracized from their house.
FWIW: it’s well worth the loss. Stay true to Truth, and to yourself–and keep your faith in God. He will take care of the rest.
God bless you, kid. (And your friend).