I don't like swearing as a general rule; I do it if the situation calls for it (if I'm angry or have just dropped something on my foot) but I don't do it as a matter of course, every other word. The reason I don't like it to excess is because it makes the environment feel tangibly negative and aggressive to me. For instance, I once had a girlfriend who could only be described as a chav - sorry if the term is offensive but it gets my meaning across, and I went to her house and her entire family was effing and blinding every other word, and I felt like a fish out of water. The atmosphere just felt so aggressive I wondered if I was gonna make it out of there alive 
...because I was the complete opposite... shy, reserved, polite. Anyway I did learn a valuable lesson from that... that contrary to what I'd been brought up to believe there was nothing wrong with it... they were a perfectly loving family... they certainly all had each other's backs... but they just had a different way of talking from what I was used to or felt comfortable with. Everyone in that family swore all the time, right down from the youngest children, up to the parents, but it didn't make any difference to their relationship.
As to why religious people take so much offence at it. Maybe it's a bit of the above... after all I was not long out of Christianity when that occurred... but other than that I don't really know. Somehow swearing in the sense of 'taking the lord's name in vain' seems to have been conflated with any type of swearing. Like the guy in Alien 3 said 'it's alright to say 'shit'... it ain't against god'... when I've said similar to my dad it seems to have come as something of a surprise to him, and gradually his swearing vocabulary has 'improved' (though mainly as a joke, not to be repeated but to be remembered... so far 'piss' and 'crap' but never a shit or a fuck
). So there's that, and I think also the fact that most swearwords have sexual connotations doesn't help for people who have particular hangups about all things sexual... perhaps it's too close for comfort to things they want to keep repressed... or perhaps some sort of fear of 'guilt by association' with god.
...because I was the complete opposite... shy, reserved, polite. Anyway I did learn a valuable lesson from that... that contrary to what I'd been brought up to believe there was nothing wrong with it... they were a perfectly loving family... they certainly all had each other's backs... but they just had a different way of talking from what I was used to or felt comfortable with. Everyone in that family swore all the time, right down from the youngest children, up to the parents, but it didn't make any difference to their relationship.As to why religious people take so much offence at it. Maybe it's a bit of the above... after all I was not long out of Christianity when that occurred... but other than that I don't really know. Somehow swearing in the sense of 'taking the lord's name in vain' seems to have been conflated with any type of swearing. Like the guy in Alien 3 said 'it's alright to say 'shit'... it ain't against god'... when I've said similar to my dad it seems to have come as something of a surprise to him, and gradually his swearing vocabulary has 'improved' (though mainly as a joke, not to be repeated but to be remembered... so far 'piss' and 'crap' but never a shit or a fuck
). So there's that, and I think also the fact that most swearwords have sexual connotations doesn't help for people who have particular hangups about all things sexual... perhaps it's too close for comfort to things they want to keep repressed... or perhaps some sort of fear of 'guilt by association' with god.
