I expect this is similar in many areas, we may have automatic beliefs in a number of areas, for any number of reasons (‘fast thinking’). When we slow down and reflect, we may challenge or modify or enrich those beliefs.
…. raising a provocative question implicit in the findings: “Obviously, there are millions of very smart and generally rational people who believe in God,” he (Joshua Greene) says. “Obviously, this study doesn’t prove the nonexistence of God. But it poses a challenge to believers: If God exists, and if believing in God is perfectly rational, then why does increasing rational thinking tend to decrease belief in God?”