A famous study by the Church of the Flying Spaghetti Monster showed that as the global number of pirates has decreased historically, the climate has warmed up. That is, there is a negative correlation between increasing global temperatures and the number of pirates. The FSM drew on this link to demonstrate that pirates are devine beings and that their decline is responsible for global warming. Arrrhh!
Of course, this study was a parody. Whilst it may be true that there are less pirates today than when climate was cooler, this is an example of pure correlation, not causation. Pirates do not keep the climate cooler, there is no mechanism for them to do so, however, the correlation in the data cannot be denied.
At the other end of the scale is, for example, the negative correlation between increased vaccination rates and the incidence of targeted infections. This is a particularly strong negative correlation, but it also has a causative basis. This is because we know the mechanism by which a vaccine protects the vaccinated, and thus can predict that in a population, there would be a negative correlation as described. This is a causation relationship that results in correlation – statistically and scientifically, the strongest possible result. Put another way, it is a hypothesis about the positive benefit of vaccination that is strongly supported by the evidence.
In the middle is the great big grey area of intellectual inquiry, also known as ‘everything else’. Recently a large meta-analysis (a study of studies – comparing different studies to draw over-arching conclusions) concluded that there is a negative correlation between intelligence and faith (Zuckeman, Silberman and Hall, 2013). That is, the higher your intelligence (analytic intelligence, such as that measured by IQ tests) the less likely you are to be religious.
Your personal reaction to that result is, perhaps unsurprisingly, likely to be influenced by your opinion on religion, and your opinion on intelligence. But what does this result really mean? Are religious people dumb? Are atheists smarter? Does high intelligence ‘cause’ un-religiousness? Does religiousness ‘cause’ low intelligence?
The short answer is ‘no’. This is just a correlation. It just suggests that on the whole, really intelligent people are less likely to be religious. However, this study went further, discussing mechanisms to explain the correlation, and here is where it moves into the area of causation.
Of these, perhaps most interesting is the notion of sense of control. A person’s sense of control over their lives is influenced by numerous factors, both internal (within their control) and external (outside of their control). The report discusses studies that have shown that if you challenge someone’s sense of control, their belief in God increases. This suggests that religion provides a means of explaining one’s life; that what you can’t control is in the hands of God (and isn’t it instructive here that we have idioms such as ‘in the lap of the Gods’?). Higher intelligence can provide a person with greater self-control, that is, they have the means to have greater control over their lives, therefore, less reliance on faith. They see and understand themselves as in control, not an external power. They also found that intelligent people are less conforming, thus less likely to be influenced by the dogma of religion.
The most common explanation they found though was that intelligent people prefer rational explanations to irrational ones. Analytical thinking is preferred over intuitive thinking. An intelligent person may view the world rationally on the basis of logical conclusions, rather that by some grand supernatural design. As a result, the build-up of rational conclusions results in a decrease in religiosity.
All this then suggests a causative mechanism – that higher intelligence fosters a greater sense of personal control and that a preference for rational thought processes reduces the need for faith, thereby reducing belief in the supernatural. If we were to take that as a hypothesis, we would expect to find, in a population, the exact negative correlation that was found if the hypothesis were to be supported.
Clearly though, I have made a circular argument, by taking a result, finding an explanation, proposing a hypothesis from that explanation, and then, completely unsurprisingly, getting the same result. Not good science on my behalf there. But what we can recover from this is that there might be a mechanism that accounts for the correlation, and that therefore, this is not simply a pure correlation. In other words, there might be a causative relationship. The existence of a number of studies that show psychological phenomena such as the personal control study discussed above demonstrates that there exists a way in which higher intelligence could lead to lower religiosity. Whilst this does not completely explain the negative correlation, it puts it firmly into the camp of ‘possible causation’, making the overall finding of a negative correlation important scientifically, pointing strongly towards the value of further research, especially into the psychological mechanisms behind religiosity.
Of course, whilst you’re not likely to be able to improve your IQ by reducing your faith, you could at least put yourself in the ‘upper half’ of the curve and tell people how you’re one of the intelligent ones!!
Zuckerman M, Silberman J, & Hall JA (2013). The Relation Between Intelligence and Religiosity: A Meta-Analysis and Some Proposed Explanations. Personality and social psychology review : an official journal of the Society for Personality and Social Psychology, Inc PMID: 23921675