It’s what happens when you exchange the truth about God for a lie and worship and serve the creature rather than the Creator.
Satan has gotten more mileage out of *Did God REALLY say....* than any other tactic he’s tried. Doubt the veracity and integrity of the Word and look what happens; deception all the way around. People just haven’t learned from Eve yet.
True. There’s not a Christian church or group that is immune, either. That’s why pointing out the errors of this or that “Protestant” church is really no defense. Error is error, we’re provided with the standard against which it is to be tested. That’s true of any church of any kind and true of individuals as well. Will there be differing emphases? Sure. There’s room for that. There’s also room for disagreement upon meaning, outside the core, foundational message of salvation. There are many traditions and doctrines of many churches with which I might disagree, from mildly to strongly. Mild disagreements center around interpretation, not contradiction. Contradiction merits strong disagreement. That it sometimes comes from learned, even exalted men who wrap themselves in the cloak of infallibility makes it even more dangerous.