Maybe the fact the most potent swear words in English, are still Anglo Saxon words, is relevant. We began to 'lose' that language nearly 1000 years ago, but still access it automatically, when swearing.
In the early, 1990s, I had a job teaching in the US and once horrified my class of middle school aged kids by casually letting drop the word "Hell!" Not particularly the bible belt, although it was a smalltown where a lot of people did go to church of a Sunday... They seemed horrified. I had to explain it wasn't really seen as a swear word at all "where I come from". The religious ones have lost their power over us, here.