Dr Bob seems to think that if you don't know everything, you can't know anything. Not an uncommon belief and apologetic view among Evangelical Literalists.
Cosmologists and Physicists understand, can explain or suspect answers coming to much more than Scientist Bob seems to be able to give them credit for or even ever heard of.
...not to mention explaining his disbelief at a First Grade Level
"Scientist huh? More like Faith restricted I'd say
I don't get this guy"