d4g,
"I have hypothesized this correlation has a lot to do with why we left to begin with."
Yes, we have discussed this previously on this site. I'm an ENTJ. It is a predicted outcome. Intuition, it appears, is an advantage in today's world when it is coupled with Thinking. When it is coupled with Feeling, Houston, we may have a problem. The contributing factors for those who leave religion, become irreligious, a-relgious or atheist are: Intelligence, Personality Type, Education, Prosperity and Culture.
Culture is a contamination factor that skews all data, as Muslims aren't likely to lose their religion because they might also lose their head in the process. And dubs lose their families. And so on. The other 4 are the real factors. Prosperity seems to be a minor factor (look at the US as an example).
Intelligent people are more likely atheist or irreligious, as are Rationals and those with Graduate and Post Graduate Education (as they are exposed to the analytical, empirical evidence process). Lots of empirical studies suggest these correlations. But again class, these are nothing other than correlations; there is not a cause/effect.