Your verse does not prove your contention. Your verse says nothing about faith. In fact it is clear from context that this is hypothetical, the legal system for righteousness, which no one fulfills and which condemns all.
CONTEXT
2:1 Wherefore thou art without excuse, O man, whosoever thou art that judgest: for wherein thou judgest another, thou condemnest thyself; for thou that judgest dost practise the same things. 2 And we know that the judgment of God is according to truth against them that practise such things. 3 And reckonest thou this, O man, who judgest them that practise such things, and doest the same, that thou shalt escape the judgment of God? 4 Or despisest thou the riches of his goodness and forbearance and longsuffering, not knowing that the goodness of God leadeth thee to repentance? 5 but after thy hardness and impenitent heart treasurest up for thyself wrath in the day of wrath and revelation of the righteous judgment of God; 6 who will render to every man according to his works: 7 to them that by patience in well-doing seek for glory and honor and incorruption, eternal life: 8 but unto them that are factious, and obey not the truth, but obey unrighteousness, shall be wrath and indignation, 9 tribulation and anguish, upon every soul of man that worketh evil, of the Jew first, and also of the Greek; 10 but glory and honor and peace to every man that worketh good, to the Jew first, and also to the Greek:
[the point is that this legal standard condemns all men]
11 for there is no respect of persons with God. 12 For as many as have sinned without law shall also perish without the law: and as many as have sinned under the law shall be judged by the law; 13 for not the hearers of the law are just before God, but the doers of the law shall be justified: 14 (for when Gentiles that have not the law do by nature the things of the law, these, not having the law, are the law unto themselves; 15 in that they show the work of the law written in their hearts, their conscience bearing witness therewith, and their thoughts one with another accusing or else excusing them); 16 in the day when God shall judge the secrets of men, according to my gospel, by Jesus Christ.
17 But if thou bearest the name of a Jew, and restest upon the law, and gloriest in God, 18 and knowest his will, and approvest the things that are excellent, being instructed out of the law, 19 and art confident that thou thyself art a guide of the blind, a light of them that are in darkness, 20 a corrector of the foolish, a teacher of babes, having in the law the form of knowledge and of the truth; 21 thou therefore that teachest another, teachest thou not thyself? thou that preachest a man should not steal, dost thou steal? 22 thou that sayest a man should not commit adultery, dost thou commit adultery? thou that abhorrest idols, dost thou rob temples? 23 thou who gloriest in the law, through thy transgression of the law dishonorest thou God? 24 For the name of God is blasphemed among the Gentiles because of you, even as it is written. 25 For circumcision indeed profiteth, if thou be a doer of the law: but if thou be a transgressor of the law, thy circumcision is become uncircumcision. 26 If therefore the uncircumcision keep the ordinances of the law, shall not his uncircumcision be reckoned for circumcision? 27 and shall not the uncircumcision which is by nature, if it fulfil the law, judge thee, who with the letter and circumcision art a transgressor of the law? 28 For he is not a Jew who is one outwardly; neither is that circumcision which is outward in the flesh: 29 but he is a Jew who is one inwardly; and circumcision is that of the heart, in the spirit not in the letter; whose praise is not of men, but of God.
3:1 What advantage then hath the Jew? or what is the profit of circumcision? 2 Much every way: first of all, that they were intrusted with the oracles of God. 3 For what if some were without faith? shall their want of faith make of none effect the faithfulness of God? 4 God forbid: yea, let God be found true, but every man a liar; as it is written,
That thou mightest be justified in thy words,
And mightest prevail when thou comest into judgment.
5 But if our unrighteousness commendeth the righteousness of God, what shall we say? Is God unrighteous who visiteth with wrath? (I speak after the manner of men.) 6 God forbid: for then how shall God judge the world? 7 But if the truth of God through my lie abounded unto his glory, why am I also still judged as a sinner? 8 and why not (as we are slanderously reported, and as some affirm that we say), Let us do evil, that good may come? whose condemnation is just.
9 What then? are we better than they? No, in no wise: for we before laid to the charge both of Jews and Greeks, that they are all under sin;
10 as it is written,
There is none righteous, no, not one;
11 There is none that understandeth,
There is none that seeketh after God;
12 They have all turned aside, they are together become unprofitable;
There is none that doeth good, no, not so much as one:
13 Their throat is an open sepulchre;
With their tongues they have used deceit:
The poison of asps is under their lips:
14 Whose mouth is full of cursing and bitterness:
15 Their feet are swift to shed blood;
16 Destruction and misery are in their ways;
17 And the way of peace have they not known:
18 There is no fear of God before their eyes.
19 Now we know that what things soever the law saith, it speaketh to them that are under the law; that every mouth may be stopped, and all the world may be brought under the judgment of God: 20 because by the works of the law shall no flesh be justified in his sight; for through the law cometh the knowledge of sin.
21 But now apart from the law a righteousness of God hath been manifested, being witnessed by the law and the prophets; 22 even the righteousness of God through faith in Jesus Christ to all them that believe; for there is no distinction; 23 for all have sinned, and fall short of the glory of God; 24 being justified freely by his grace through the redemption that is in Christ Jesus: 25 whom God set forth to be a propitiation, through faith, in his blood, to show his righteousness because of the passing over of the sins done aforetime, in the forbearance of God; 26 for the showing, I say, of his righteousness at this present season: that he might himself be just, and the justifier of him who has faith in Jesus. 27 Where then is the glorying? It is excluded. By what manner of law? of works? Nay: but by a law of faith. 28 We reckon therefore that a man is justified by faith apart from the works of the law. 29 Or is God the God of Jews only? is he not the God of Gentiles also? Yea, of Gentiles also: 30 if so be that God is one, and he shall justify the circumcision by faith, and the uncircumcision through faith.
CONTEXT
2:1 Wherefore thou art without excuse, O man, whosoever thou art that judgest: for wherein thou judgest another, thou condemnest thyself; for thou that judgest dost practise the same things. 2 And we know that the judgment of God is according to truth against them that practise such things. 3 And reckonest thou this, O man, who judgest them that practise such things, and doest the same, that thou shalt escape the judgment of God? 4 Or despisest thou the riches of his goodness and forbearance and longsuffering, not knowing that the goodness of God leadeth thee to repentance? 5 but after thy hardness and impenitent heart treasurest up for thyself wrath in the day of wrath and revelation of the righteous judgment of God; 6 who will render to every man according to his works: 7 to them that by patience in well-doing seek for glory and honor and incorruption, eternal life: 8 but unto them that are factious, and obey not the truth, but obey unrighteousness, shall be wrath and indignation, 9 tribulation and anguish, upon every soul of man that worketh evil, of the Jew first, and also of the Greek; 10 but glory and honor and peace to every man that worketh good, to the Jew first, and also to the Greek:
[the point is that this legal standard condemns all men]
11 for there is no respect of persons with God. 12 For as many as have sinned without law shall also perish without the law: and as many as have sinned under the law shall be judged by the law; 13 for not the hearers of the law are just before God, but the doers of the law shall be justified: 14 (for when Gentiles that have not the law do by nature the things of the law, these, not having the law, are the law unto themselves; 15 in that they show the work of the law written in their hearts, their conscience bearing witness therewith, and their thoughts one with another accusing or else excusing them); 16 in the day when God shall judge the secrets of men, according to my gospel, by Jesus Christ.
17 But if thou bearest the name of a Jew, and restest upon the law, and gloriest in God, 18 and knowest his will, and approvest the things that are excellent, being instructed out of the law, 19 and art confident that thou thyself art a guide of the blind, a light of them that are in darkness, 20 a corrector of the foolish, a teacher of babes, having in the law the form of knowledge and of the truth; 21 thou therefore that teachest another, teachest thou not thyself? thou that preachest a man should not steal, dost thou steal? 22 thou that sayest a man should not commit adultery, dost thou commit adultery? thou that abhorrest idols, dost thou rob temples? 23 thou who gloriest in the law, through thy transgression of the law dishonorest thou God? 24 For the name of God is blasphemed among the Gentiles because of you, even as it is written. 25 For circumcision indeed profiteth, if thou be a doer of the law: but if thou be a transgressor of the law, thy circumcision is become uncircumcision. 26 If therefore the uncircumcision keep the ordinances of the law, shall not his uncircumcision be reckoned for circumcision? 27 and shall not the uncircumcision which is by nature, if it fulfil the law, judge thee, who with the letter and circumcision art a transgressor of the law? 28 For he is not a Jew who is one outwardly; neither is that circumcision which is outward in the flesh: 29 but he is a Jew who is one inwardly; and circumcision is that of the heart, in the spirit not in the letter; whose praise is not of men, but of God.
3:1 What advantage then hath the Jew? or what is the profit of circumcision? 2 Much every way: first of all, that they were intrusted with the oracles of God. 3 For what if some were without faith? shall their want of faith make of none effect the faithfulness of God? 4 God forbid: yea, let God be found true, but every man a liar; as it is written,
That thou mightest be justified in thy words,
And mightest prevail when thou comest into judgment.
5 But if our unrighteousness commendeth the righteousness of God, what shall we say? Is God unrighteous who visiteth with wrath? (I speak after the manner of men.) 6 God forbid: for then how shall God judge the world? 7 But if the truth of God through my lie abounded unto his glory, why am I also still judged as a sinner? 8 and why not (as we are slanderously reported, and as some affirm that we say), Let us do evil, that good may come? whose condemnation is just.
9 What then? are we better than they? No, in no wise: for we before laid to the charge both of Jews and Greeks, that they are all under sin;
10 as it is written,
There is none righteous, no, not one;
11 There is none that understandeth,
There is none that seeketh after God;
12 They have all turned aside, they are together become unprofitable;
There is none that doeth good, no, not so much as one:
13 Their throat is an open sepulchre;
With their tongues they have used deceit:
The poison of asps is under their lips:
14 Whose mouth is full of cursing and bitterness:
15 Their feet are swift to shed blood;
16 Destruction and misery are in their ways;
17 And the way of peace have they not known:
18 There is no fear of God before their eyes.
19 Now we know that what things soever the law saith, it speaketh to them that are under the law; that every mouth may be stopped, and all the world may be brought under the judgment of God: 20 because by the works of the law shall no flesh be justified in his sight; for through the law cometh the knowledge of sin.
21 But now apart from the law a righteousness of God hath been manifested, being witnessed by the law and the prophets; 22 even the righteousness of God through faith in Jesus Christ to all them that believe; for there is no distinction; 23 for all have sinned, and fall short of the glory of God; 24 being justified freely by his grace through the redemption that is in Christ Jesus: 25 whom God set forth to be a propitiation, through faith, in his blood, to show his righteousness because of the passing over of the sins done aforetime, in the forbearance of God; 26 for the showing, I say, of his righteousness at this present season: that he might himself be just, and the justifier of him who has faith in Jesus. 27 Where then is the glorying? It is excluded. By what manner of law? of works? Nay: but by a law of faith. 28 We reckon therefore that a man is justified by faith apart from the works of the law. 29 Or is God the God of Jews only? is he not the God of Gentiles also? Yea, of Gentiles also: 30 if so be that God is one, and he shall justify the circumcision by faith, and the uncircumcision through faith.
