musterion,
re: "...we do have that ability."
Then perhaps you can help. As I said, I've never been able to consciously choose any of the beliefs that I have and I would like to be able to do that. If you think that you can consciously CHOOSE to believe things, I wonder if you might explain how you do it. What do you do at the last moment to instantly change your one state of belief to another? What is it that you do that would allow you to say, "OK, at this moment I have a lack of belief that 'x' exists or is true, but I CHOOSE to believe that 'x' exists or is true and now instantly at this new moment I do believe that 'x' exists or is true"?
Maybe you could use something like leprechauns to demonstrate your ability and technique. According to the Encyclopedia Britannica, a leprechaun is "fairy peculiar to Ireland, who appeared in the form of an old man of minute stature, wearing a cocked hat and a leather apron" and who stores a pot of gold at the end of a rainbow and if ever captured has to grant 3 wishes. So, assuming that you don't already have a belief in them, how about right now, while you are reading this, CHOOSE to believe - be convinced without a doubt - that they exist. Now that you believe in leprechauns, my question is, how did you do it? How did you make the instantaneous transition from lack of belief to belief?