The international study is included because it is about religiosity and intelligence not religiosity and job preference whether you agree that IQ is a good measure of intelligence or not it is established in the literature as a measure for this purpose with caveats If you have cites showing that the overwhelming majority agree that malnutrition and cultural differences are the cause please add them It would make that article a more accurate one NAS members are far from a random selection of US highly intelligent people A random selection of highly intelligent people would include people from many walks of life many different jobs including I suspect theologians It is OR to suggest otherwise but this is the mistake commonly assumed when this section is included Consider this logic Maybe many scientists were not invited to join the National Academy of Sciences but since the invitation did not take into account the scientists gender race sexuality etc NAS contains a random sample of eminent scientists Hence the section says that a lot of highly educated people aren t female black gay etc In fact since the males whites gays outnumber the females blacks gays it is clear that the vast majority of a random sample of highly educated people aren t female black gay clearly not a logical path to follow FWIW According to Academy membership requires distinguished research scholarship but that is rarely sufficient to ensure membership Considerable weight is also given to public service as well as more political factors such as where a nominee works and whom he or she knows I am sure I have read this elsewhere as well