You don't need religion to learn about morality. Watching Mr. Rodgers or reading Winnie the Poo would do. As you get older you can get into Machiavelli and start really becoming a principled person.
My point is that Mr. Rodgers doesn't take all these teachings out of thin air, as is mentioned in the PBS article.
It seems that major themes are taken from Jesus Christ's teachings, and His Sermon on the mount. See: https://www.biblegateway.com/passage/?search=Matthew+5-7&ver...
> Having the Church community while growing up was great. But the fact that admission to this community required total philosophical adherence is just bizarre.