From Wikipedia (http://en.wikipedia.org/wiki/Religiosity_and_intelligence):

Studies comparing religious belief and I.Q.

In 2006, a self-published non-peer review study was undertaken^[3] to investigate, on a country-by-country level, the possibility of a link between the importance of religion to citizens and their average IQ. The study found that the strength of religious belief in countries was inversely related to their average IQ. The countries with higher IQs on average had significantly lower levels of religious belief than those with lower average IQs. The study has subsequently drawn criticism^{[citation needed]} for neglecting the influence of several critical confounding factors, such as the work of religious institutions in deliberately focusing missionary work in third world countries where educational opportunities are concurrently poor.

In 2007, Danish newspapers reported that a study conducted by controversial intelligence researcher Helmuth Nyborg estimated that atheists’ IQs were on average nearly 6 points higher than believers’.^[4] The study is based on data from the National Longitudinal Study of Youth, which includes intelligence tests on a representative selection of American youth, where they have also replied to questions about religious belief. ” I’m not saying that believing in God makes you dumber. My hypothesis is that people with a low intelligence are more easily drawn toward religions, which give answers that are certain, while people with a high intelligence are more skeptical,” says the former professor.

its crazy!!! thoughts?  suprisingly (well, not really) jews are the smartest believers