For your information: The Catholic Church does not teach this. There is a novel Catholic theory of invincible ignorance, but it is not infallible. Therefore, it could be totally wrong.
“(those who, in their ignorance, still follow the commands of their conscience become a law unto themselves), as it says in Romans.”
But that’s not what it says:
“For when Gentiles, who do not have the law, by nature do what the law requires, they are a law to themselves, even though they do not have the law. They show that the work of the law is written on their hearts, while their conscience also bears witness, and their conflicting thoughts ACCUSE or EVEN excuse them”
Their conscience accuses them or EVEN excuse them. The “excuse” them is condemnation. Read the entire chapter in context.
Romans 2:13 - “For it is not the hearers of the law who are righteous before God, but the doers of the law who will be justified.”
James 2:10 - “For whoever keeps the whole law but fails in one point has become accountable for all of it.”
Romans 3:20 - “For by works of the law no human being will be justified in his sight, since through the law comes knowledge of sin.”
Yes, true. Thanks for the correction. It has not been declared infalliable.