Does "Christendom" Teach The Faith that was once delivered unto the saints? No

Have the shepherds of christendom been like the Bereans and actually searched the scriptures to verify what they have been taught?

No, normalcy bias overlooks, always appealing to so and so said, not what the scriptures say.

And it All boils down to Inherited lies that have blinded their eyes.

pleasers of men, hearts far from Him