Man ignores the plain truth of Scripture, when it does not agree with his theology: “Whereas we have a hand in the process of sanctification and can affect it by our obedience or disobedience, God alone justifies us” (Tho. Constable). God says (in Romans!) that obedience results in righteousness, Rom 6.16 NASB.
The law of Moses this side of the Cross of Christ had lost its function, so any attempts to insert it into the Way or to impose it upon others was an attempt to use it for self-justification. It was not only a lost cause, but an attack upon the sufficiency of Christ’s sacrifice.