I am not personally happy with terms like willingness. I like to know why things are as they are, in this case why are some people willing to believe. In short, I believe that willingness is rests on a motivation, a need to believe. But that just takes us to the problem of understanding why we have needs. What we really need are things like food clothing air water, a reasonable atmospheric temperature, etc, true needs. So what on earth could be a need to believe. What aspect of survival is being served. Surely not physical life so it has to be a need that is no exactly real but perceived, created. I believe, therefore that the need is of the ego, a need for self affirmation, a need that makes one feel good rather than bad, a need that arises out of our predicament of duality, the experience of pleasure and pain. We experience this want as need. I suggest that the need to believe is a need to identify with what brings pleasure and to avoid feelings of pain, to see one's self as a good person rather than as somebody who is bad. But that raises the question as to how we came by such a need, and to that I would suggest the answer is past experience, that we have all been made to feel bad, to hate something about ourselves, to have been told early on in our lives that we will only get love if we conform to some moral standard at which we had previously failed. Having been told that our natural wants were punishable and evil, we but into a conformist plan to be and to identify with the good our guardians believe in. In this way we acquire the need to conform, to live by unnatural standards, to hate our natural state and to worship some external ideal. We become divided and at war with ourselves, always careful to keep out of consciousness our desire to return to who we were really meant to be. We try to fill our emptiness with something we were told is a good external. But that can never fill our need so we remain always needy. What we seek, I think, and can't ever allow ourselves to know, is out true selves, a self we were taught is filthy but isn't.