Religious beliefs can be a sign, if not an actual cause, of impaired critical thinking. It depends on the severity of course; however such impairment can lead to, or at least imply, a lack of critical thinking in other areas, which leaves a person ripe for fleecing by those out to capitalise on the gullible. That's largely how Trump happens.
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'