Weird, I was wondering the exact same thing today. If you’re looking for something authoritative, I have a sneaking suspicion that nothing exists. I have horrendous language and was once quite accomplished in my ability to be vulgar, sometimes taking it to an art form. At least I broke the habit of saying g-d, or saying “Jesus” improperly since my conversion-reversion. I am now turning toward working on foul language. But “oh my gosh”, “doggone it”, “i’ll be darned”, and the like really are derived from blasphemous phrases. If you are thinking about cutting “oh my gosh” out of your vocabulary, perhaps you should. Sorry, got nothing authoritative for you, just a weak opinion.