Actually I don't. The default position is that the original covenant stands unless you can prove that it doesn't. You haven't proven it.
open heart,
1. You have not proved scripturally that the law of Moses is still in effect or even modified.
I have given you scripture and it's context.
Galatians 3:19 plainly says the law came because of transgressions and was till the seed should come which was the Messiah. Why? So the promise of Messiah to save man which we know was the Levitical priesthood and blood of bulls and goats.
So I understand that directly it was salvation but it is a part of the big picture of the abolishment of the whole context of the Mosaic Covenant of law.
2. Your modification of the law vs. the whole law being abolished is the argument.
3. The Ten Commandments being a ministration of death was to be done away with. 2 Corinthians 3:7. The glory of the 10 Commandments under Moses law ministry of condemnation not as glorious as the ministration of righteousness Verse 9.
Verse 13 was plain about Moses with the veil over his head so Israel could not see what would be abolished. Reference to Exodus 34:32-35.
That was the Ten Commandments which was 9 moral laws and the ceremonial sabbath that was abolished and this is why Israel is still blind when the Torah is read which Moses wrote.
4. Verse 6 says we are able ministers of the New Testament, not of the letter, but of the Spirit. For the Letter killeth and the Spirit giveth life.
I understand this can and is used to prove the Mosaic law is separate from the Covenant and is still in effect only to the Spirit and not to the letter.
5. The problem is the Ten Commandments was a summation of the whole law and it moral with exception to the sabbath.
But you say the Moral law could not be done away with or abolished but that is what it is saying.
It could not be the moral law within the moral itself because it was before the law of Moses and he has always been the moral governor of the universe.
It stands to reason that what was abolished was the context of the Ten Commandments according to the Mosaic Law which was the Old Covenant.
You can make modification and non-abolish arguments in certain scriptures but it won't reconcile with the overall context which is the abolishment of the whole law of Moses.
6. For the Jew the law was forever but not under the letter of Moses.
It would be under the New Covenant of Christ.
The letter involves the commandments about doing the commandments and how to do them and in what spirit or motive.
7. Since the Jew culturally was wrapped in the law of Moses Jews can be Jews by practicing the Jewish way of living.
8. The Gentiles were never under the covenant and Peter didn't want to put the customs of Jewish onto them which he called a yoke of bondage.
Physical circumcision was in Judaism in the Old Covenant and was mandatory not just to perform but not use it as justification for salvation.
Gentiles can do physical circumcision but not to be justified for salvation either.
9. Modification of the law means to live the letter with the right spirit or motive and for the Jew this fits the context of culture and gentiles would have to become Jews like the stranger at the gates proselyted.
The abolishment of the Mosaic law of the Old Covenant prevents the Gentiles from falling into the mentality of the law of its weakness for most have no deep enough understanding of the Mosaic law and the mechanics of the covenant.
It also helps Jews understand the better promises of the New Covenant through the power of Christ.
Legally, the Old Covenant has been replaced by the New Covenant which has to be understood as an Old Will and a New Will.
10. Last, Hebrews 9: 16-17; the testator had to die before the Testament could be in force and had no strength while the testator was living. This is in connection with Roman's 7:1-4 of not being able to coexist.
The only way your modification view can work for a Jew is through the New Covenant and it's standard and ethics and the poet of the risen Lord.
The only sure way to come to an agreement is probably to go through the 613 laws and see if you can do them and how and why. Jerry kelso