Ok, so the first one is a pretty well known error on their parts.
The primacy of conscience was argued by both that if one ignored their own sense of right and wrong, there was something very perverse with that person, barring an instance of actual grace that illuminated the person's mind. By that same token, every human being is obligated to legitimately seek God through natural law which sets the groundwork to accept revelation.
I've never encountered the third claim. Can you cite both where they make that claim and the Scripture that refutes it? Asking for a friend.
@Faith In The Ruins..."Augustine tells this story to provide a saintly witness for his argument that lying is always morally wrong, regardless of the circumstances, and to note that God is perfectly capable of extricating from trouble those who stand fast in the truth. His treatise has been widely cited ever since, and his viewpoint was endorsed by no less saintly a scholar than Thomas Aquinas. In the monumental Summa Theologiae, Thomas states the same position: “Therefore it is not lawful to tell a lie in order to deliver another from any danger whatever. Nevertheless it is lawful to hide the truth prudently, by keeping it back, as Augustine says” (II:110:3).
Is Lying Ever Right? | Catholic Answers Magazine
They are refuted first by the Biblical account of the midwives lied to Pharo in order to save babies from being killed and god rewarded them Exodus 1:15-22
Second refuted by the lie told by Rahab to save the spies and she was rewarded by God and praised in Hebrews 11:31
Cool. I didnt realize there was a Scriptural argument that strongly supports mental reservation. Very interesting post. Thanks!