We weren't really told it was a sin I guess but that it was more honorable or optimal to not do anything except reflect and socialize on Sunday? It's not as ext

We weren't really told it was a sin I guess but that it was more honorable or optimal to not do anything except reflect and socialize on Sunday? It's not as extreme as what my great grandmother talks about where they really did nothing on Sunday. She was an atheist too so there definitely was a shift in American culture here.