Too much overconfidence, or self self assuredness, causes people to reject evidence that is different from how their minds are already made up. Strong beliefs and confidence can cause people to reject scientific evidence.
Religious fundamentalists tend to be super confident, but within religious thought, there is the concept of humbleness. Humbleness before God. I think this concept can be used for opening the minds of some people. Few people want to admit they are a "know it all." At the same time, it does seem to me like a lot of religious folks have forgotten the concept of humbleness to the point of being over confident in their own righteousness.
I was brought up in fairly open minded religion so I realize that not all religion is self-righteous. I also know that science, in itself, can be very humbling. Scientists are often reevaluating what they are thinking as new evidence does have a tendency to upset old thinking. Willingness to learn is a form of humbleness.
Self deprecating humor is a good thing. I hear quite a bit of self deprecating humor in science lectures I watch on YouTube.
I think more people need the realization that we owe a lot of our successes to the work of others. Another concept coming to mind is gratitude. I've even heard it said in churches as I was growing up. We can be thankful.
Some of my thoughts after reading this article. Overconfidence bolsters anti-scientific views, study finds.