i think beliefs change over time. they may evolve into something stronger and more defined, or you may find that it no longer fits you or your situation... I think maybe what you want to ask is if it's their doubt that's creeping in? I know I have had moments like that, where I felt like a traitor to who I was in the past because I saw the validity of others' arguments for or against something... mostly I hate it when I find myself agreeing with my dad, who I always said I would never agree with... is that somewhere along the lines of what you were asking? or totally off base?