For what it's worth, the same amount I'm charging you, I do not believe many so called rock-solid beliefs are really such. I like to think of the mind as elastic instead of clay. This wey the belief can stay and be held in place or ejected as from a sling-shot.
O-Uknow~ I must say, I like your question not only for its content but also for its wording. Nice! To answer, I do find beliefs are glass. They appear solid but will bend if blown on a certain way. The mind can be thick and act like a thug on a spinning wheel but always has the ability to be spun into beauty.