Well done! You're the first person to see the point of the whole argument: Sinful Christians, that go on to say all us Christians are sinners like themselves, because they themselves are committing sins, is bad judgmentalism.
Good job.
"Some Christians confess they are still sinners doing sinful works. They then go on to declare that we all are sinners still committing sins and trespasses." Denying you are a sinner manifests the sin of pride
And some such Christians make it humble to be a sinner against God.
Isa 5:20
Woe unto them that call evil good, and good evil; that put darkness for light, and light for darkness; that put bitter for sweet, and sweet for bitter!
Humbleness is repenting of sinning against God, not continuing to be a sinner.
Jas 4:6
Draw nigh to God, and he will draw nigh to you. Cleanse your hands, ye sinners; and purify your hearts, ye double minded. Humble yourselves in the sight of the Lord, and he shall lift you up.
Denying we are a sinner, if we are committing sin against God, is self-deciet.
Jer 2:35
Yet thou sayest, Because I am innocent, surely his anger shall turn from me. Behold, I will plead with thee, because thou sayest, I have not sinned.
Christians believing and teaching that we are not condemned if we sin, are saying God is not angry at our own sin, because we have not sinned against Christ like others, that are condemned for doing the same.
Rom 2:3
And thinkest thou this, O man, that judgest them which do such things, and doest the same, that thou shalt escape the judgment of God?
Rom 6:1
What shall we say then? Shall we continue in sin, that grace may abound? God forbid. How shall we, that are dead to sin, live any longer therein?
Judging yourself to be sinless is "wrong judgmentalism".
Judging ourselves to be sinless as Jesus Christ, who lives in us, and we in His holy Spirit and temple, is judging Jesus Christ to be sinless, and has no sin in His own body:
Judging we are doing His righteousness through faith in Him, and not committing sin of the devil, is judging ourselves by our works.
1Jo 3:5
And we know that he was manifested to take away our sins; and in him is no sin.
How can we, that have Jesus Christ the righteous, with our own sin taken away, have sin in Him?
Jesus Christ has no sinful member sinning in His own body, but only His righteous saints.
2 Cor{6:14}
Be ye not unequally yoked together with unbelievers: for what fellowship hath righteousness with unrighteousness? and what communion hath light with darkness? And what concord hath Christ with Belial? or what part hath he that believeth with an infidel? And what agreement hath the temple of God with idols? for ye are the temple of the living God;
Jesus christ does not unequally yoke Himself to sinners, but only joins Himself with newborn sons of God doing righteousness as He is:
1 John{3:7}
Little children, let no man deceive you: he that is doing righteousness is righteous, even as he is righteous.
1 John{2:29}
If ye know that he is righteous, ye know that every one that is doing righteousness is born of him.
Only a sinful Christ has sinners in his kingdom, that are committing sins against the true God.
1Jo 3:8
He that is committing sin is of the devil; for the devil is sinning from the beginning.
Moral maturity may be attained in this life, but not perfect sinlessness.
Sinners can certainly be morally mature by doing less evil in this life, but only purified saints of God are doing good and not evil:
Jas 1:27
Pure religion and undefiled before God and the Father is this, To visit the fatherless and widows in their affliction, and to keep himself unspotted from the world.
3 John{1:11}
Beloved, follow not that which is evil, but that which is good. He that is doing good is of God: but he that is doing evil hath not seen God.
The moral relativism of sinners, by sinning less, is not the righteousness of God,t hat does good at all times:
Psa 106:3
Blessed are they that keep judgment, and he that are doing righteousness at all times.
Jhn 8:29
And he that sent me is with me: the Father hath not left me alone; for I do always those things that please him.
1Jo 2:6
He that saith he abideth in him ought himself also so to walk, even as he walked.
How can we that say we abide in Him not walk as He walked, but do those things that displease Him?
Being credited with sharing the righteousness of Christ (per Rom 3:20-5:1) does not mean saints do not sin.
If being credited with sharing the righteousness of Christ, means committing sin against Jesus Christ, then 'credited with sharing' is not 'being imputed' by God.
And finally, how can we share the righteousness of Jesus Christ, while ciommitting unrighteous with the devil?
2 Cor{6:14}
Be ye not unequally yoked together with unbelievers: for what fellowship hath righteousness with unrighteousness? and what communion hath light with darkness? And what concord hath Christ with Belial?
Being credited with sharing the righteousness of Christ (per Rom 3:20-5:1) does not mean saints do not sin.
"Some Christians confess they are still sinners doing sinful works. They then go on to declare that we all are sinners still committing sins and trespasses."
I have never heard a righteous Christian saint ever declare that all Christians must also be doing righteousness, and not sinning against our Lord and Savior Jesus Christ.