Debora MacKenzie writes on New Scientist:
Charles Darwin and Albert Einstein famously did not believe in a supernatural God, and neither do some scientists today. It now appears there may be a good reason for this: thinking analytically dims supernatural beliefs, apparently by opposing the intuitive thought processes that underpin them.
The vast majority of people believe in a supernatural god or gods, says social psychologist Ara Norenzayan of the University of British Columbia in Vancouver, Canada. Yet there are hundreds of thousands of atheists and agnostics who do not. While scientists have begun to study the psychology of belief, we know little about what causes disbelief.
Humans use two separate cognitive systems for processing information: one that is fast, emotional and intuitive, and another that is slower and more analytical.
The first system innately imputes purpose, personality or mental states to objects, leading to supernatural beliefs. People who rely more on intuitive thinking are more likely to be believers, while the more analytical are less likely.