Can’t think of any Africans who swear.
Or Asians generally, though I’d imagine some cultures do.
It’s mostly a European/Anglo thing in my corner of the world 
Staunchly atheist. Cursing shows poor diction; didn’t utter a swear until I was 14 and still only do it quoting or along to music. There’s no reason for it, it doesn’t communicate your ideas more readily…
Some curses are especially versatile and one needs a few, possibly many, alternatives to cover all their nuances.
Like…sheeeeeit.
My daughter, now 30. She didn’t get it from me.
When I was a kid, one of my friends had a dad who didn’t swear. Once when greatly provoked he was heard to exclaim “Dingbust yer frazzlin’ hide, you stoopnagle!”
Okey diddly doodly. Diddly.
Nah, I don’t know anyone who doesn’t curse. Well, I think maybe my old Sikh office mate, come to think of it, but I’m not really a swearer at work either, so it’s hard to say.
ETA: And by “old” I meant previous. He was about 10 years younger than me.
Good luck on your quest. And if you need a little guidance you can refer to the South Park song:
Step 1: Instead of ass say buns, like “kiss my buns” or “you’re a buns hole”.
Step 2: Instead of shit say poo, as in “bull poo”, “poo head” and this “poo is cold”.
I was never a big swearer, but I chose to give it up 99.9% of the time when my kiddos were born. I knew they would learn it somewhere, but it wasn’t going to be from me.
The problem with so many people that swear regularly is that they use such words as an easy fallback when they don’t know the correct word to use. We have a lot of truly eloquent non-swear words in the English language that get the point across just fine.
Take the “f” word. We all know someone who uses that word in lieu of nouns, verbs, adjectives, etc. It’s lazy and reduces the intended impact of the word. Curse words have great impact as occasional exclamations. They are attention-getters. They lose that impact if they are used constantly.
There’s plenty of folks I know that I haven’t heard swear. Definitely not my family, though. I’m careful about what company and context I’m in before I swear, but I swear freely. I love the percussive quality of many English swear words and the stress relief they provide. I wish I had one tenth the creativity of the Scots when it comes to English language swearing, though. Works of art their turns of phrase are.
Sure: me. I have no desire to express myself in that manner. If it works for you, fine, but that’s not me. Emergency Room doctors have given me permission to swear, which just seems odd to me. It’s not that I’m suppressing the urge to curse. I just don’t have the urge to do so.
I just saw this yesterday on line and it people the swear may be more honest and I
swear and I am also very honest . 
After the collective voices of 65,000,000 people screaming FUUUUUUCK on election day, no I don’t.
I never heard my mother-in-law utter a single curse ever, under any circumstances.
I never heard my father-in-law curse until he was 93, was in a rehabilitation center for a broken hip, and was being pushed by his physical therapist.
I don’t often swear at work, unless among a crowd which does (which happens fairly regularly at ad agencies, actually 
).
At my last job, I had three guys who reported to me. They rarely heard me swear, and if I did drop an F-bomb, it absolutely got their attention, in a “ohhh, crap, things got real” sort of way. However, I was always very clear to them that, “I’m not swearing at you – I’m just swearing!”
The Mormon side of my family won’t even say “damn.”
My gramma, a fundy Mormon who considered “gosh” a serious swear, got really profane when her dementia got bad. God rest her soul, but it was kinda funny to hear her tell grandpa to fuck off.
Well, not in a language you understand …