A few points:

1) I am a Christian from an evangelical background, though I don't "identify" (if you'll forgive my use of a real obscenity) as evangelical these days, as too many people take the word to mean extreme right wing lunatic (especially in the US). Regardless of this fact, I don't find swearing offensive in films, TV programmes, provided it is used in a dramatically appropriate way.

2) On the subject of using "Jesus Christ" as a swear word, naturally as a Christian I disapprove, but he doesn't mean the same to non-Christians as he does to me, so I don't feel offended. (Nor does Jesus, I suspect, and I've long since given up the unfortunate evangelical habit of getting offended on his behalf. God doesn't need anyone to defend him.) On another note, when Christians talk about "taking the Lord's name in vain", I actually think that command is more about being a good ambassador, and nothing to do with vocabulary. Let me put it this way: I'm sure God is a lot more bothered if I oppress the poor but don't swear, than if I were to help the poor but use the occasional four letter word.

3) As to the four-star word in question, it's considered less offensive here than in America (and can be used endearingly), and a lot less offensive in places like France, which consider the word "bitch" far more offensive. Cultural context really does make a huge difference.