Why take a driving test if you know you will fail?
And, just how does this question relate to anything we've been discussing with you? I see no relevance at all.
Why obey the rules if the rules are there just to show you you are a failure?
Once again, ditto. Please explain your concerns, whatever, so they can be understood. Your questions seem meaningless.
For it is not those who hear the law who are righteous in God's sight, but it is those who obey the law who will be declared righteous.
Rom 2:13
Why don't you believe the other things Paul wrote about the Law?
For example:
Rom 3:20 - Therefore no one will be declared righteous in God’s sight by the works of the law; rather, through the law we become conscious of our sin.
Gal 2:16 - know that a person is not justified by the works of 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 the works of the law, because by the works of the law no one will be justified.
Gal 3:5 - So again I ask, does God give you his Spirit and work miracles among you by the works of the law, or by your believing what you heard?
Gal 3:10 - For all who rely on the works of the law are under a curse, as it is written: “Cursed is everyone who does not continue to do everything written in the Book of the Law.”
Gal 3:19-25
19 Why, then, was the law given at all? It was added because of transgressions until the Seed to whom the promise referred had come. The law was given through angels and entrusted to a mediator.
20 A mediator, however, implies more than one party; but God is one.
21 Is the law, therefore, opposed to the promises of God? Absolutely not! For if a law had been given that could impart life, then righteousness would certainly have come by the law.
22 But Scripture has locked up everything under the control of sin, so that what was promised, being given through faith in Jesus Christ, might be given to those who believe.
23 Before the coming of this faith, we were held in custody under the law, locked up until the faith that was to come would be revealed.
24 So the law was our guardian until Christ came that we might be justified by faith.
25 Now that this faith has come, we are no longer under a guardian.
Heb 7:19 - (for the law made nothing perfect), and a better hope is introduced, by which we draw near to God.
Why don't you believe these verses?
So beware of folk who would judge brothers and sisters in Christ falsely, and slander them as evil, and reject them from the gospel of grace and love, while these people honour, love and follow Jesus.
So beware of those who profess to be Christians but DON'T believe what Jesus taught.