Paul wasn't an historian. His focus was to preach the gospel, that is Christ and Him crucified.
It is very disturbing that there is this conflict in God's church. That so many, perhaps even the majority, believe that we can enter heaven without obedience is perplexing to me. Paul was never in disagreement with Jesus regards the necessity to be obedient. He simply couched it in different terms.
Do we then make void the law through faith? God forbid: yea, we establish the law....12 Wherefore the law is holy, and the commandment holy, and just, and good. Romans 3:31; 7:12.
Paul also said, "Shall we sin that grace may abound? God forbid! How shall we, that are dead to sin, live any longer therein?.... What then? shall we sin, because we are not under the law, but under grace? God forbid. Know ye not, that to whom ye yield yourselves servants to obey, his servants ye are to whom ye obey; whether of sin unto death, or of obedience unto righteousness? But God be thanked, that ye were the servants of sin, but ye have obeyed from the heart that form of doctrine which was delivered you. Being then made free from sin, ye became the servants of righteousness. I speak after the manner of men because of the infirmity of your flesh: for as ye have yielded your members servants to uncleanness and to iniquity unto iniquity; even so now yield your members servants to righteousness unto holiness. For when ye were the servants of sin, ye were free from righteousness. What fruit had ye then in those things whereof ye are now ashamed? for the end of those things is death. But now being made free from sin, and become servants to God, ye have your fruit unto holiness, and the end everlasting life. For the wages of sin is death; but the gift of God is eternal life through Jesus Christ our Lord."
(Romans 6:1,2,15-23.)
Clearly, obedience to God's commandments was as important to Paul as any of the other contributors to the New Testament canon.