Christians argue about the law of God in a way in which the Jews never did.
Jews may have obeyed or transgressed the law, and debated points of law, but they never argued about whether the law ought to be kept and obeyed.
But Christians actually argue about whether to keep the law of God or not, and some even go so far as to argue against keeping the law, as though doing the law were a sin against grace: they demonize the law and doing the law of Christ as becoming enemies of grace and the cross of Christ.
Why is that?
For not the hearers of the law are just before God, but the doers of the law shall be justified. (Rom 1)
But be ye doers of the word, and not hearers only, deceiving your own selves. (James 1)
The law of God is the word of God written plainly in Scripture: no Christian argues against being doers of the word, so why argue against being doers of the law?
Because they misread how the letter kills, but the Spirit gives life, and falsely conclude keeping the letter of the law is death.
The foolish argument is about whether to be doers of the law and word, and the right argument is about how the letter of the law kills without the Spirit:
Who also hath made us able ministers of the new testament; not of the letter, but of the spirit: for the letter killeth, but the spirit giveth life. (2 Cor 6)
How can the letter of the law kill, when it is the same life giving Spirit who gives us the letter of the law in Scripture?
Scripture here is speaking of the letter as opposed to the Spirit, which is the letter only without the Spirit.
Keeping the letter of the law only, without the Spirit, is death and not life in Christ Jesus.
Even as faith only is dead without works, so the letter only is dead without the Spirit.
But Israel, which followed after the law of righteousness, hath not attained to the law of righteousness. Wherefore? Because they sought it not by faith, but as it were by the works of the law. For they stumbled at that stumblingstone. (Rom 9)
The letter in Scripture kills, when it is obeyed as it were by law on paper only, and not by law of God written in the heart with the Spirit.
To obey the letter only without the heart is still death of the soul, for only by obeying the letter from the heart by grace through faith is there righteousness, life, and peace with God.
And since the letter of the law of Christ written in Scripture is the law written in our hearts and minds, then no man can be disobeying the letter on paper, and yet be doing the law from the heart.
Unlike the unbelieving Jews that were dead by letter only, Christians are to keep the letter of the law and do it well by grace through faith.
The Jews erred by seeking the righteousness of the law only, without faith, and Christians err by seeking righteousness by faith only, without the law.
Christians ought to do the righteousness of God, without leaving the letter of His law undone:
Woe unto you, scribes and Pharisees, hypocrites! for ye pay tithe of mint and anise and cummin, and have omitted the weightier matters of the law, judgment, mercy, and faith: these ought ye to have done, and not to leave the other undone.
And God forbid Christians should seek to abolish the law of Christ altogether as written, which even the unbelieving Jews never dared to do.
The law of God is not without the Spirit, and the Spirit of God is not without His law:
There is therefore now no condemnation to them which are in Christ Jesus, who walk not after the flesh, but after the Spirit. For the law of the Spirit of life in Christ Jesus hath made me free from the law of sin and death.
Making oneself do the letter of the law only kills the spirit, and making oneself spiritual without the letter of the law only kills righteousness.