I was raised in a Christian family and I call myself Christian.
I've never understood this "my faith prevents me from playing this game" thing. I mean violence and sex? I hate to have to burst your bubble, but God made boobs, too. You're not living in faith; you're living in denial of what the world is like. It makes no sense.
Avoiding it because you just don't like it or because a child is too young makes perfect sense, but for most fundies your standard T rated stuff will do fine.