Probably just a ploy so people can't call him a "fedora atheist neckbeard" despite him checking all of the boxes.
Theres also this:
View attachment 432745
Intelligence tests are a freud in itself to some degree.
See, there is a difference between knowledge and intelligence. For example, Bob can read as many books as he wants, if he does use the knowledge he learns through the books to any use or make connections between information, he is not really all that intelligent to begin with.
Furthermore, intelligence tests were once invented to just determine if a kid was smart enough to leave kindergarten and join elementary school (in other words, they are the most simplistic form of intelligence) and if anything, they are meant to test a basic level of being able to use logic and associations to solve a problem.
For example, the riddle "A roster stands on a roof with four sides, each side directing in one direction (north, south, east,w est) . The roster lays an egg. in which direction does the egg roll?
Answer: Of course none, cause rosters are male.
This is a very logical question to see if someone is able to actually get to identify the "trap" in the question instead of taking it just for granted.
So, Bob wants grown up adults to take a test invented to measure how smart kids are? What would it say if he fails something Ralph Wiggum would have no problems to solve?