Not just jokes https://pbs.twimg.com/media/E_RHERXXIAIFAAi?format=png
He was so well-read that he played the "dumb guy" well.
I can see the point he is trying to make, although I think it's nonsense
To what truth does he refer to? You don't get to pick and choose which bits you like and which you don't, when making this kind of argument.
Norm had a scathing criticism, and it was the most serious I'd ever seen Norm. He said something like: "It's not funny to use Harry Potter to make fun of Christians. J.K. Rowling is a Christian, and she said if you understand the Gospels, you'll know how the Harry Potter series will end."
Now there was a bit on Seinfeld about how someone had converted to Judaism simply to gain the right to tell Jewish jokes. And Jerry was talking to his therapist about this and the therapist said, "So, this offends you as a Jewish person?" And Jerry replied, "No, it offends me as a comedian."
Despite his faith, one inferred from his LCS critique that the Harry Potter joke offended him not as a Christian, but as a comedian. That's how professional a comic he was.
Same way he refused to do any Trump jokes. Norm didn't want applause, he wanted laughter.