Actually, that is "taking the lord's name in vain" and is quite frowned upon by a lot of Christians. I am not Christian, but I grew up in the Bible Belt and I am aware that is deemed to be a serious form of disrespect. I swear like a sailor, but I try to not take the lord's name in vain in public because I am aware it is deeply offensive to devout Christians, more so than my general tendency to use four letter words.