Indoctrination can be hard to break, after all we used to really believe this stuff so why wouldnt it be hard to break.
I remember the 1st time i vocalisied out loud that there is no god I felt odd and slightly conflicted.
But once the curtain has been pulled back and there is no wizard there really is no going back to that nonsense, but even so years can go by before it is fully peeled away.