Neurobiologist Robert A. Burton in his book 'On Being Certain' states that the sensation of being sure about one’s beliefs is an emotional response separate from the processing of those beliefs.
The brain subconsciously protects itself from wasting processing power on problems for which you’ve already found a solution that’s good enough. ‘I'm right’ is a feeling you get so that you can move on. It’s a subconscious laziness so that it’s harder to reexamine one’s beliefs than it is to embrace certainty.
That's why I started the post, the importance of uncertainty. Once a person believes say, in Noah's flood or that different languages came from God confusing language at the Tower of Babel then it's very unlikely that a person will ever go back and revisit the cause of their believe because it's kind of locked in and good enough.