I personally dont see why shame should be part of it.
When we know better we believe better. That is just the way it works.
Pity the man (or woman) who didnt hold some erroneous belief at some point in life and then replace it with a better one when they recognized it.
That is one of the duties (and joys) of living - to be alert to growth and change and embrace it.
You sound like a good person with an interesting job ILoveTTATT2!