Then you are a good honest guy, Nicolau -
However, I think there a good number not quite so honest. I also think that are grey scales to belief, and also the weird quality of self-delusion.
Example, certain ones who hold on to invisible coming 1914 as if it were the holy grail in the face of absolute evidence to the contrary. Many that I have known are more than smart enough to figure it out, but "choose" to "believe" it anyway.
Do they really "believe"? How can we ever know? They say they do and they act out upon it. In that case they are "choosing" their belief in a sense. They say that if you keep lying to yourself long enough you can eventually come to think you really "believe" it...kind of like a nonbeliever con-man who becomes a TV evangalist for the money.
But, I see your point, and there is nothing nutty about it the way you explained it.