Freemind: "Hodson and Busseri (2012) found in a correlational study that lower intelligence in childhood is predictive of greater racism in adulthood, with this effect being mediated (partially explained) through conservative ideology. They also found poor abstract reasoning skills were related to homophobic attitudes which was mediated through authoritarianism and low levels of intergroup contact."
Lower intelligence is also a factor for religiosity. In a meta-analysis of 63 studies (The Relation Between Intelligence and Religiosity), Zuckerman, Silberman and Hall showed a significant negative association between
intelligence and religiosity. The association was stronger for for religious beliefs than religious behavior. Three possible interpretations were
discussed. First, intelligent people are less likely to conform and, thus, are
more likely to resist religious dogma. Second, intelligent people tend to adopt
an analytic thinking style, which has been shown to
undermine religious beliefs. Third, several functions of religiosity, including
compensatory control, self-regulation, self-enhancement, and secure attachment,
are also conferred by intelligence. Intelligent people may therefore have less
need for religious beliefs and practices.