God created the "legal" obligation God has never created any legal obligation from Him to mankind. That's a primary point of Paul's teaching in Romans 3 and 4.
Eternal life is not a reward for works we do
So you say. But Paul through the Holy Spirit says contrary:
6 For [God] will render to every man according to his works: 7 to those who by patience in well-doing seek for glory and honor and immortality, he will give eternal life[.]
God will render (reward) "according to works," and the stated reward (to those who are obedient and persevere) is "eternal life."
Yes, that is what the verse says.
The rest of your paragraph following this first clause is but so much opinion with nothing offered to substantiate it. Accordingly, I'm disregarding it.
But now apart from the law the righteousness of God has been made known, to which the Law and the Prophets testify. This righteousness is given through faith in Jesus Christ to all who believe. There is no difference between Jew and Gentile, for all have sinned and fall short of the glory of God, and all are justified freely by his grace through the redemption that came by Christ Jesus. God presented Christ as a sacrifice of atonement, through the shedding of his blood—to be received by faith. He did this to demonstrate his righteousness, because in his forbearance he had left the sins committed beforehand unpunished — he did it to demonstrate his righteousness at the present time, so as to be just and the one who justifies those who have faith in Jesus.
Where, then, is boasting? It is excluded. Because of what law? The law that requires works? No, because of the law that requires faith. For we maintain that a person is justified by faith apart from the works of the law. Or is God the God of Jews only? Is he not the God of Gentiles too? Yes, of Gentiles too, since there is only one God, who will justify the circumcised by faith and the uncircumcised through that same faith. Do we, then, nullify the law by this faith? Not at all! Rather, we uphold the law. (Romans 3:21-31) No, I'm not the one who is pitting Paul against Paul. What he consistently teaches is that God will NOT count our sins against us if we are under grace. That is what is meant by "imputing" or "imputation" of righteousness. We are found in Christ, not having a righteousness of our own that comes from the law, but that which is through faith in Christ--the righteousness that comes from God on the basis of faith. (see Philippians 3:9).
Gill's Exposition of the Bible explains what Romans 2:6 means by God rendering to every man according to his works:
Who will render to every man according to his deeds. God will be the Judge, who is righteous, holy, just, and true; every man in particular will be judged; as the judgment will be general to all, it will be special to everyone, and will proceed according to their works; for God will render to wicked men according to the demerit of their sins, the just recompense of reward, eternal damnation; and to good men eternal life, not according to the merit of their good works, which have none in them, but according to the nature of them; such who believe in Christ, and perform good works from a principle of grace, shall receive the reward of the inheritance, which is a reward of grace, and not of debt. In other words, God will render to evil men according to the true desert of their evil deeds; and of his own free grace will render to good men, whom he has made so by his grace, what is suitable and agreeable to those good works, which, by the assistance of his grace, they have been enabled to perform.
You are getting stuck in the same rut many do who imagine their works are what justifies them. If that is what you want to cling to, then I doubt anything I or anyone else says to you will change your mind. Continuing to argue the same points is a waste of time. I'll continue to pray for you and all those who are reading these threads for eyes and hearts to be opened to the grace of God that brings salvation.
For in the gospel the righteousness of God is revealed--a righteousness that is by faith from first to last, just as it is written: "The righteous will live by faith." (Rom. 1:17)