Blasphemy is an attack on God; the Pythons did not intend to attack God with this film, only those who blindly follow without any kind of intelligent thought. Terry Jones and John Cleese have an ongoing debate about whether the film is heretical or not, though.
I actually know a lot of Christians who love Life of Brian. Anyone who reacts to humor with hostility and fear is doing themselves no good. Ease up and have a laugh.
On the other hand, I think it's important to self-analyze and take the criticisms seriously, rather than dismissing them through laughter.
Brian, your girlfriend's reaction might have been one of fear. She was 13, after all, and seeing someone question religion can be frightening to someone at that age; i.e., someone who isn't used to having their beliefs challenged, someone who hasn't even finished high school. I don't know how I might have handled the film at that age, since I was very religious then (I'm not now). But by late high school/college, it perfectly fit my question-everything frame of mind. I think you have to reach an age where you're adult enough to accept that you might not be right about everything in the world, and then you let go of some of that insecurity about being wrong. Some people never get that far.
But no, it's not blasphemous. The Pythons could have been taken to court in England if it was (Graham Chapman was taken to court for blasphemy because of a poem in a magazine he published); but no lawyer would have had a leg to stand on. It's offensive, perhaps, but not blasphemous.
