This person seems to be saying that people grown and raised in a specific religion don't question their own religion. I was indoctrinated as a young child into essentially a religious cult and if I ever tried to question any of the beliefs of myself and others around me, I was silenced. I see this in many people in very fundamental religious settings (not always obviously) but it happens.

You shouldn't judge people based on their beliefs, but sometimes those beliefs shape who they are and how they act. If they can't question those beliefs, then they could be living a life that goes against even their own morals (or other's wellbeing). It's who people are, but why we have certain ideologies should be important and questioned.