30, 40, 50, 60 years ago people still swore. No, Jimmy Stewart didn't swear in his movies just like any other star didn't. Andy Griffith, Beaver, Lucy, etc. didn't swear either on TV. The Beatles and Elvis and the Beach Boys had clean lyrics. However, in real life once the censors weren't there people still swore. There was a little more class to it at the time though. People wouldn't swear in mixed company around women or kids as much unlike today, but during a heated battle in a hockey game there was bad language probably similar to today.
However, whether Cherry had policies in place for his teams to not use blasphemy is another story, he doesn't elaborate on that. Hard to believe that a guy who toiled around in the minors would have never heard blasphemy though.