Let me guess, Bloody Hotdogs!, he was born a JW?
Genius has nothing to do with knowledge, it has to do with intelligence.
I know plenty of intelligent individuals that have weird, irrational beliefs because of a fear of exploring beyond their comfort zone.
I had to have a psych evaluation about 15 years ago and scored over 145 on an actual, non-online, Stanford Binet IQ test given by a psychologist. That's adequate for Mensa, I believe. (Or someone told me)
But, I still believed the JW bull crap because I never went to college and never wanted to or learned to use my critical thinking skills on my own beliefs.