First, let me say I am fairly surprised and pleased that you finally make an opposing argument by Scripture, and not by your own views alone.
The ignorant of the world having God consciousness and conscience, is without hearing the law of God, and the word of faith of Jesus Christ.
Acts 10.1 At Caesarea there was a man named Cornelius, a centurion in what was known as the Italian Regiment. 2 He and all his family were devout and God-fearing; he gave generously to those in need and prayed to God regularly. 3 One day at about three in the afternoon he had a vision. He distinctly saw an angel of God, who came to him and said, “Cornelius!”
4 Cornelius stared at him in fear. “What is it, Lord?” he asked.
The angel answered, “Your prayers and gifts to the poor have come up as a memorial offering before God. 5 Now send men to Joppa to bring back a man named Simon who is called Peter. 6 He is staying with Simon the tanner, whose house is by the sea.”
Cornelius was a gentile convert to OT Judaism, who knew the law of Moses and did it righteously.
He then became a gentile convert to the NT faith of Jesus Christ, with birth and baptism of the Holy Spirit.
Rom 2.26 So then, if those who are not circumcised keep the law’s requirements, will they not be regarded as though they were circumcised?
This is in defence of gentile converts to Jesus Christ, who had no outward circumcision of the law, and yet recieved the Spirit's circumcision of the heart by recieving the faith of the Lord Jesus.
Your best effort to justify the ignorant with Godly manners, is Rom 2:12,
Rom 2:12 For as many as have sinned without law shall also perish without law: and as many as have sinned in the law shall be judged by the law; (For not the hearers of the law are just before God, but the doers of the law shall be justified.
Rom 2:14 For when the Gentiles, which have not the law, do by nature the things contained in the law, these, having not the law, are a law unto themselves: Which shew the work of the law written in their hearts, their conscience also bearing witness, and their thoughts the mean while accusing or else excusing one another;)
Rom 2:16In the day when God shall judge the secrets of men by Jesus Christ according to my gospel.
This would appear to be speaking of Gentiles during OT Isreal, whio behave with godly manners, and yet ignorant of the the covenant and law of the God of Israel.
However, the first Scripture dismisses any such justification with ignorance of the true God.
Rom 2:12 For as many as have sinned without law shall also perish without law: and as many as have sinned in the law shall be judged by the law;
This is in response to the old saw of justification by ignorance. How can God justly judge them that have not heard? God can and does: Any that sin are guilty before Him, whether having heard His law of not. I.e. it is the very God conscience given to all men by creation in His image, that condemns any child of disobedience in the world.
It does not promote justification with God by ignorance, but rather confirms that "ignorance of the law is no excuse".
(For not the hearers of the law are just before God, but the doers of the law shall be justified. For when the Gentiles, which have not the law, do by nature the things contained in the law, these, having not the law, are a law unto themselves: Which shew the work of the law written in their hearts, their conscience also bearing witness, and their thoughts the mean while accusing or else excusing one another;)
The Scripture then returns to the hearers of the word, and only them doing the word are justified with God, the Jew first and also the Gentile.
Rom 2:16In the day when God shall judge the secrets of men by Jesus Christ according to my gospel.
The whole of Rom 2 is about no knowledge of the word justifes any man not doing the truth of God. Jesus Christ justifies the uncircumcised Gentiles through faith and circumcision of the Spirit, while condemning Jews born to the law with outward circumcsion, but do not the law of God by Jesus Christ.
When transitioning from any man to hearing Jews and Gentiles, a single Scripture dismisses out of hand any argument for justification by ignorance of the law and gospel of Jesus Christ. I.e.
"What about them that haven't heard? Can God judge them?" This is the old excuse made by hearers, that are not doers, looking for loopholes in the just and impartial judgment of God by every man's works.
Because all men are created in the image of God and lightened by Christ coming into the world, then every one on earth begins with God conscious conviction for doing evil. And since, all men have sinned against the righteousness of God, whether hearing His law or not, no man is innocent by ignorance of the law.
Especially them that hear and do not.
Thanks for the Scriptural challenge. I think it's the only time you have done so, since you first offered a Scripture for choosing to accept Jesus Christ.