You have put marketing considerations above the rational search for the truth. I do not think you would have done the same thing when you were considering atheism: "will this true belief make me less marketable?" And you should not do it now.
Atheists, one presumes, are not known for making objectively false statements. That they are an out-group is entirely beside the point.
This is interesting, I wonder if there's anything to it: International variation in IQ – the role of parasites (paper) by Christopher Hassall of U. Carleton.
It strikes me as the sort of thing that could be as big an issue as lead in the environment. Raise the sanity waterline: improve health!