You would expect, therefore, that the books of the New Testament written by Peter, James and John, as well as Jesus' teachings as found in the gospels, to be consistent with the dispensation of circumcision (i.e. law) and for Paul to be the one who teaches that we are no longer under the law (i.e. uncircumcision), which happens to be exactly what we find, which, in turn, is why your proof texting doesn't. You are unwittingly arguing against your own doctrine.
What is found in the Hebrew epistles is indeed consistent with the following words which the Lord Jesus spoke to the Jews here:
"Very truly I tell you, the one who believes has eternal life" (Jn.6:47).
"It is the spirit that quickeneth; the flesh profiteth nothing: the words that I speak unto you, they are spirit, and they are life" (Jn.6:63).
The Apostle Paul repeatedly used the words "free" and "liberty" when referring to the fact that those in the Body of Christ have been set free from the law:
"And that because of false brethren unawares brought in, who came in privily to spy out our liberty which we have in Christ Jesus, that they might bring us into bondage" (Gal.2:4).
"Stand fast therefore in the liberty wherewith Christ hath made us free, and be not entangled again with the yoke of bondage" (Gal.5:1).
In fact, Paul charged the Galatians not to use the liberty as a base of operations for sin:
"For, brethren, ye have been called unto liberty; only use not liberty for an occasion to the flesh, but by love serve one another" (Gal.5:13).
The following words of Peter are likewise speaking of being free and at liberty from the law:
"As free, and not using your liberty for a cloke of maliciousness, but as the servants of God" (1 Pet.2:16).
James speaks of the "perfect law of liberty":
"But whoso looketh into the perfect law of liberty, and continueth therein, he being not a forgetful hearer, but a doer of the work, this man shall be blessed in his deed" (James 1:25).
Are we to believe that the "law of liberty" spoken of here is the Law, which Peter referred to as a "yoke"?:
"Now therefore why tempt ye God, to put a yoke upon the neck of the disciples, which neither our fathers nor we were able to bear?" (Acts 15:10).
Paul also referred to the Law as a "yoke of bondage":
"Stand fast therefore in the liberty wherewith Christ hath made us free, and be not entangled again with the yoke of bondage" (Gal.5:1).
Paul contrasted the "yoke of bondage" with the "liberty" which belongs to all who have been set free from the law. So common sense dictates that the "perfect law of liberty" of which James speaks is not the Law of Moses. In fact, James tells us exactly how those who received his epistle were saved:
"Of his own will begat he us with the word of truth, that we should be a kind of firstfruits of his creatures" (Jas.1:18).
Peter also said that those who received his epistle were born of God by the gospel:
"Being born again, not of corruptible seed, but of incorruptible, by the word of God...And this is the word which by the gospel is preached unto you" (1 Pet.1:23,25).