lie noun (2)
1b: an untrue or inaccurate statement that may or may not be believed true by the speaker or writer.- Merriam-Webster online dictionary
You are correct. Words matter. Sincere or not PASTOR RUSSELL TAUGHT LIES.
"I'm just telling you that your terms are wrong, grammatically speaking." Your statement is factually incorrect; however I don't have the formal education to conjure up a Latin phrase to buttress my position.