Buckethead wrote a post on denialism that’s worth reading.
I’ve always admired, but never really trusted, people who think in a very questioning manner – i.e. people who are always questioning their beliefs.
That sort of thinking has never really worked for me. I have to try on new ideas. I’ve had better luck believing in ideas without reservation, finding someone smart who disagrees, and arguing with them a lot. Of course, one still has to be open to changing one’s position after the argument.