Our brains have built-in biases that stack the odds against objectivity, so much so that the success of the scientific endeavor can be attributed to one factor: it pits itself against our natural leanings, erects barriers across the openings to rabbit trails, and systematically exposes faulty thinking to public critique. In fact, the scientific method has been called "what we know about how not to fool ourselves" (p. 50).
It is easy for us to distort the evidence in our own favor, in part because we aren't so great with the evidence in general. One of the strongest built-in mental distortions we have is called confirmation bias. Once we have a hunch about things work, we seek information that fits what we already think. It's like our minds set up filters . . . (p. 51).
I am looking forward to more insights from the field of cognitive science. More advances have been made in this field in the last 10 years than in any other field of study I can think of. This is going to be a serious problem for believers as what they once thought was unique to their particular religion, and could only be explained on the basis of the supernatural, is really something that all human beings, regardless of their religion or lack of religion, may experience.