If a doctor prescribed a medicine for one ailment, would you tell him you will not accept it because it does not help with another ailment?
Below are some scriptures regarding salvation by grace through faith vs. the law. Please read them.
Acts 13:38-39
Therefore, my brothers, I want you to know that through Jesus the forgiveness of sins is proclaimed to you. Through him everyone who believes is justified from everything you could not be justified from by the Law of Moses.
Acts 15:5-11
Then some of the believers who belonged to the party of the Pharisees stood up and said, “The Gentiles must be circumcised and required to obey the Law of Moses.”
The apostles and elders met to consider this question. After much discussion, Peter got up and addressed them: “Brothers, you know that some time ago God made a choice among you that the Gentiles might hear from my lips the message of the gospel and believe. God, who knows the heart, showed that he accepted them by giving the Holy Spirit to them, just as he did to us. He made no distinction between us and them, for he purified their hearts by faith, Now then, why do you try to test God by putting on the necks of the disciples a yoke that neither we nor our fathers have been able to bear? No! We believe it is through the grace of our Lord Jesus that we are saved, just as they are.”
Romans 3:19-24
Now we know that whatever the law says, it says to those who are under the law, so that every mouth may be silenced and the whole world held accountable to God. Therefore no one will be declared righteous in his sight by observing the law; rather, through the law we become conscious of sin. But now a righteousness from God, apart from law, has been made known, to which the Law and the Prophets testify. This righteousness from God comes through faith in Jesus Christ to all who believe. There is no difference, for all have sinned and fall short of the glory of God, and are justified freely by his grace through the redemption that came by Christ Jesus.
Romans 3:27-28
Where, then, is boasting? It is excluded. On what principle? On that of observing the law? No, but on that of faith. For we maintain that a man is justified by faith apart from observing the law.
Romans 4:4-5
Now when a man works, his wages are not credited to him as a gift, but as an obligation. However, to the man who does not work but trusts God who justifies the wicked, his faith is credited as righteousness.
Romans 4:13-15
It was not through law that Abraham and his offspring received the promise that he would be heir of the world, but through the righteousness that comes by faith. For if those who live by law are heirs, faith has no value and the promise is worthless, because law brings wrath. And where there is no law there is no transgression.
Ergo (The best way to not break the law is to have no law to break.)
Romans 7:1-6
Do you not know, brothers -- for I am speaking to men who know the law -- that the law has authority over a man only as long as he lives? For example, by law a married woman is bound to her husband as long as he is alive, but if her husband dies, she is released from the law of marriage. So then, if she marries another man while her husband is still alive, she is called an adulteress. But if her husband dies, she is released from that law and is not an adulteress, even though she marries another man. So, my brothers, you also died to the law through the body of Christ that you might belong to another, to him who was raised from the dead, in order that we might bear fruit to God. For when we were controlled by the sinful nature, the sinful passions aroused by the law were at work in our bodies, so that we bore fruit for death. But now, by dying to what once bound us, we have been released from the law so that we serve in the new way of the Spirit, and not in the old way of the written code.
Romans 9:30-32
What then shall we say? That the Gentiles, who did not pursue righteousness, have obtained it, a righteousness that is by faith, but Israel, who pursued a law of righteousness, has not attained it. Why not? Because they pursued it not by faith but as if it were by works. They stumbled over the “stumbling stone.”
Romans 10:4
Christ is the end of the law so that there may be righteousness for everyone who believes.
Romans 14:5-6
One man considers one day more sacred than another; and another man considers every day alike. Each one should be fully convinced in his own mind. He, who regards one day as special, does so to the Lord.
1 Corinthians 15:56
The sting of death is sin, and the power of sin is the law. But thanks be to God! He gives us the victory through our Lord Jesus Christ.
Galatians 2:15-16
We who are Jews by birth and not ‘Gentile sinners’ know that a man is not justified by observing the law, but by faith in Jesus Christ. So we, too, have put our faith in Christ Jesus that we may be justified by faith in Christ and not by observing the law, because by observing the law no one will be justified.
Galatians 2:19-21
For through the law I died to the law so that I might live for God. I have been crucified with Christ and I no longer live, but Christ lives in me. The life I live in the body, I live by faith in the Son of God, who loved me and gave himself for me. I do not set aside the grace of God, for if righteousness could be gained through the law, Christ died for nothing.
Galatians 3:1-4
You foolish Galatians! Who has bewitched you? Before your very eyes Jesus Christ was clearly portrayed as crucified. I would like to learn just one thing from you: Did you receive the Spirit by observing the law, or by believing what you heard? Are you so foolish? After beginning with the Spirit, are you now trying to attain your goal by human effort?
Galatians 3:10
All who rely on observing the law are under a curse, for it is written” “Cursed is everyone who does not continue to do everything written in the Book of the Law.” Clearly no one is justified before God by the law, because, “The righteous will live by faith.”
Galatians 3:13-14
Christ redeemed us from the curse of the law by becoming a curse for us, for it is written: “Cursed is everyone who is hung on a tree. He redeemed us in order that the blessing given to Abraham might come to the Gentiles through Christ Jesus, so that by faith we might receive the promise of the Spirit.
Galatians 3:15-19
Brothers, let me take an example from everyday life. Just as no one can set aside or add to a human covenant that has been duly established, so it is in this case. The promises were spoken to Abraham and to his seed. The Scripture does not say “and to his seeds,” meaning many people, but “and to your seed,” meaning one person, who is Christ.
What I mean is this: The law, introduced 430 years later, does not set aside the covenant previously established by God and thus do away with the promise. For if the inheritance depends on the law, then it no longer depends on a promise; but God in his grace gave it to Abraham through a promise. What, then, was the purpose of the law? It was added because of transgressions until the Seed to whom the promise referred had come.
Galatians 3:23-25
Before this faith came, we were held prisoners by the law, locked up until faith should be revealed. So the law was put in charge to lead us to Christ that we might be justified by faith. Now that faith has come, we are no longer under the supervision of the law.
Galatians 5:1-4
It is for freedom that Christ has set us free. Stand firm, then, and do not let yourselves be burdened again by a yoke of slavery (law). Mark my words! I, Paul, tell you that if you let yourselves be circumcised, Christ will be of no value to you at all. Again I declare to every man who lets himself be circumcised that he is obligated to obey the whole law. You who are trying to be justified by the law have been alienated from Christ; you have fallen away from grace.
Ephesians 2:14-15
For he himself is our peace, who has made the two one and has destroyed the barrier, the dividing wall of hostility, by abolishing in his flesh the law with its commandments and regulations.
Colossians 2:13-17
When you were dead in your sins and in the uncircumcision of your sinful nature, God made you alive with Christ. He forgave us all our sins, having canceled the written code, with its regulations, that was against us and that stood opposed to us; he took it away, nailing it to the cross. And having disarmed the powers and authorities, he made a public spectacle of them, triumphing over them by the cross. Therefore do not let anyone judge you by what you eat or drink, or with regard to a religious festival, a New Moon celebration or a Sabbath day. (Food law, Feasts and holy days)
Hebrews 7:18-19
The former regulation is set aside because it was weak and useless (for the law made nothing perfect), and a better hope is introduced, by which we draw near to God.
Hebrews 8:13
By calling this covenant “new,” he has made the first one obsolete; and what is obsolete and aging will soon disappear.
II Corinthians 3:6
He has made us competent as ministers of a new covenant -- not of the letter but of the Spirit; for the letter kills, but the Spirit gives life.
2 Timothy 1:9
He has saved us and called us to a holy life—not because of anything we have done but because of his own purpose and grace.
Titus 3:4
But when the kindness and love of God our Savior appeared, he saved us, not because of righteous things we had done, but because of his mercy.