Belief in God provides a framework for seeking and accepting truth at a greater rate than non-belief. The gospel of Jesus Christ provides an understanding of how God is—his character—as well as how we truly are—the base tendencies of human nature. It also provides tools to help us overcome our innate nature and become more like God is. Because believers understand their starting point and the end goal, they are enabled to seek and accept truth at a faster pace than non-believers. While a nonbeliever may be content with a more passive approach to self-refinement, a true believer will not rest until they have overcome the character traits, attitudes, and actions that prevent a fullness of happiness in this life and in the world to come.
Can you routinely go through a preconceived notion inventory, and totally dismantle everything you think you know, rebuilding with only those things that withstand the fire of inquiry and introspection? The prospect of such a life is unpalatable to most, including those who try to be good people.