This is less useful than it sounds. Disappointingly, there are not too many ideas that are believed solely by stupid people. As mentioned before, even creationism can muster a list of Ph.Ds who support it. When I was much younger, I was once quite impressed to hear that there were creationist Ph.Ds with a long list of scientific accomplishments in various fields. Since then, I learned about compartmentalization.

I don't think compartmentalization completely explains this phenomenon. I remember a usenet or Straight Dope debate from a decade and change back where a PHD specialized in molecular biology strongly and honestly expressed an argument for the young-earth creationist theory (and no, she she was not an evangelical christian, she was Jewish). Now molecular biologists wouldn't have to be experts in genetics and evolution per-se - though they've certainly studied the basics - but they do see all kinds of real world data every day that supports the idea that evolution has taken place over a very long period of time - specifically in examples of vestigial structures across basically all kingdoms and phyla.

There is no conclusion I could take from all this except that she was incompetent as a molecular biologist. If you can compartmentalize that much it would seem you lack something - not pure intelligence - but some capacity for abstract thought that would seem necessary to do something as basic as devise a series of experiments to test a new hypothesis.