I understand your disbelief in people believing this nonsense. You and Old Reggie pointed out it's all based on a legend. None of it is supported by Scripture.
However, for them they are taught to never question or disagree with their religious authorities. They bow down to them. They kiss the big guy's ring. They call them father. They even believe the clerics have the power to command God to do what they want.
On what legend is the Immaculate Conception based?
I disagree with my priests all the time. In RCIA a preist gave some explanation and said, Is that okay?" and one of the Sponsors said, "NO!" emphatically. I usually don't make my disagreements so publicly but the priests I hang with know about them.
They even believe the clerics have the power to command God to do what they want.
WEll, it might help if you could find where we teach that. But absent your doing so, I'm going to file that as another example of, well, something other than the truth being told by our opponents.