Ray, my apologies; my response was rather flippant. About an hour after I posted, I realized I had not given your excellent blog the attention it deserved. And then I got busy and forgot.
For almost thirty years of being in a Recovery Program, witnessing change in worldviews has become matter of fact; opening to change is a basic principle and daily occurrence. Yet your question went deeper than these observations. Once that change has occurred, how open are those people to change again or question how they got where they did?

This topic is not new to me. I have a masters in clinical psychology and more to the point I have been a lifelong student of spiritual paths and philosophies. Obviously, people do not believe in anything they do not take as truth: why abandon these, often hard-won, lessons?  Experience, the intimacy of revealed "truth," takes precedent. The past becomes the textbook. Yet we all have filters, ways of seeing and interpreting events according to old messages. Self-prophecizing. All of us tend to see things as we are rather than as they are (paraphrasing Nin and Buddha and Jesus). 
The NEED for certainty is a pathology. Faith demands no proof or supports. Two basic characteristics of true faith are an openness to discovery and the ability to hold ambiguity. The ego likes black and white and surety; it's survival rests on these things. Image is the life-blood and breath