there is no distinction...all have sinned and fall short of the glory of God, being justified freely by His grace through the redemption which is in Christ Jesus...demonstrating...His righteousness in the present time, so that He might be righteous and the One who justifies him who is of the faith of Jesus...the law of faith. For we account that a man is justified by faith apart from the works of the law......
Behold, the Lamb of God, who takes away the sin of the world!
If anyone sees his brother sinning a sin not unto death, he shall ask and he will give life to him, to those sinning not unto death. There is a sin unto death; I do not say that he should make request concerning that. All unrighteousness is sin, and there is sin not unto death.
1 Jn 5:16-17 has nothing to do with a fantasy of "righteous vs ungodly sinners." Rather 16-17 concerns children of God, in His assembly, God's discipline of His own, born-anew, family (cf 1 Pet 4:17; 1 Cor 11:30).
Our conscience is deep. In our spirit. Our deepest part. Rm 9:1; 8:16; 1:9; Zech 12:1; 1 Thes 5:23. It's also in our heart. Heb 10:22. Unbelievers' spirits are dead (Eph 2:1; Gen 2:17), void of God. Though the conscience...still can function. Rm 2:14-15; cf Gen 3:7. The only way to know God is to receive God, because God is receivable. He's the Spirit and He became the life-giving Spirit. The way to receive Christ is to meet Him personally.
For when Gentiles, who have no law, do by nature the things of the law, these, though they have no law, are a law to themselves, who show the work of the law written in their hearts, their conscience bearing witness with it and their reasonings, one with the other, accusing or even excusing them.)
The true worshippers will worship the Father in spirit and truthfulness, for the Father also seeks such to worship Him. God is Spirit, and those who worship Him must worship in spirit and truthfulness. The woman said to Him, I know that Messiah is coming (He who is called Christ); when He comes, He will declare all things to us. Jesus said to her, I, who speak to you, am He.
Regeneration (Jn 1:10-12; 3:16) enlivens Christians' consciences Ac 23:1; 1 Tim 1:5; 1 Cor 8:10, 12. A weak conscience isn't a bad one, but is one overly-sensitive or without sufficient faith/knowledge. Believers should protect, be gentle with, one anothers' conscience. All consciences.