I'm pretty sure I believed instead of belief in belief, but since my beliefs didn't match those of any organized religion, I didn't have a community of other believers around me.
I've encountered a lot of theists whose beliefs didn't match those of any organized religion. They tend to assume their religious outlook is exceptional or unusual (when I first started seriously investigating people's religious beliefs, it astonished me how little real communication most people have about their beliefs with people outside a very small circle,) but they tend to form fairly similar beliefs. I would definitely not say that they're any less prone to belief in belief than theists in organized sects; if anything, I think they're more so, because they tend to let go of those beliefs that are most falsifiable.
My beliefs were cobbled together from SF and fantasy novels; they were Scientology-style weird. They were also falsifiable and falsified themselves, and the atheist videos made me stop suppressing the cognitive dissonance.
Have you ever convinced a religious person to become atheistic? How did you do this? How long did it take? Were the people in some sort of life crisis, or were they just living along?
This is probably a quite difficult task of persuasion. So stories how people were successful at it could be very interesting to improve ones' persuasion abilities.
Relatedly, it might be interesting to know what religious groups have gathered on techniques to convert people to their religion - are there some manuals/techniques floating around?