They even say that the girl had to die for the sins of the group. Throughout the episode whenever they were accussing one of the group they were sure to show them wearing their crosses.
Sorry for the rant but it's just so noticeable I can't believe I never registered it before
Don't feel bad, the bias is lost on most people until they are finally programmed by it, and then they fully agree with it. Feel good that you noticed before it was too late for you.