If I gave T-shirts with British band(s) on them to teenagers in a very Christian American family, could I cause offence? Are there any bands to avoid? For that matter, what bands would be worth looking out for - I know absolutely nothing about music!
There's a british christian band called 'delirious' who are incredibly popular in the states - you could get them a cd or t-shirt of them. Google them for mechandise In terms of offence - things with swear words or explicit lyrics will not go down well. hth
I would be very wary. If they are on the fundamentalist side of things it is possible they disapprove of secular pop/rock music completely. I know one family in this country whose kids didn't listen to any chart music until they were about 18, because their father banned it. Wacky, IME, but true.
(FWIW, the kids turned out lovely and very well-adjusted!)