Average intelligence predicts atheism rates across 137 nations
mangans.blogspot.com
mangans.blogspot.com
Skimming the article, seems to be a lot of discussion of statistical correlation and some not very persuasive speculation on causal relationships.
"Good grief. This ridiculous study is making the rounds of the atheist community, with its claim that liberals and atheists are smarter than conservatives and religious people. Look at the numbers!"
1) He doesn't buy the idea that IQ is a measurement with predictive value, which is why he doesn't think that IQ... has predictive value when guessing religious affiliation.
2) He doesn't like the author of the study.
So, just to be clear, the blog post you linked is about reasons it is not worth your time to investigate whether or not this is true, not reasons to think it's not true.
this was paul who said that, just for you folk who will think it was jesus. but still....