I believe where your missing the point here is that if both JEWS and Gentile believers are now a part of God's true ISRAEL then that means all scripture is given for our admonition upon whom the ends of the world have come *2 TIMOTHY 3:16 and we are to live by every word of it *MATTHEW 4:4. Respectfully dear brother your argument here is a silly one. Why? That is just like saying that the four Gospels are only written for JEWS therefore not relevant to gentile believers. Can you see where your reasoning is leading you and why it is not true?
Here let me provide some comments below...
Lets be clear here as all the torah (all laws) are Gods laws however the 10 Commandments are specifically God's laws as it is the work of God alone written by God on two tables of stone and spoken by God alone and called God's law *EXODUS 32:16; EXODUS 20:1-17; NEHEMIAH 10:29. The book of the law or covenant is the work of Moses as directed by God and written and spoken by Moses alone *EXODUS 24:7; DEUTERONOMY 31:24. Both God's LAW (10 commandments) and the Mosaic book of the law collectively made up the old covenant and were separated and housed in the Ark of the covenant. God's LAW (10 commandments) were place "inside" the Ark of the covenant while the Mosaic book of the laws and ordinances were placed in the side of the ark of the covenant *DEUTERNOMY 31: 26; DEUTERONOMY 10:2.
The MOSAIC laws for remission of sins are called "SHADOW" laws *HEBREWS 10:1-7 as they were prophetic in nature pointing to JESUS and God's plan of salvation in the new covenant. This is shown in detail in HEBREWS 7; HEBREWS 8; HEBREWS 9; HEBREWS 10; COLOSSIANS 2. While the scriptures teach that God's LAW (10 commandments) are the knowledge of GOOD and EVIL; SIN and RIGHTOUESNESS *ROMANS 3:20; ROMANS 7:7; 1 JOHN 3:4; PSALMS 119:172 and if we break any one of them we stand guilty before God of sin *JAMES 2:10-11. God's LAW is the work of God alone *EXODUS 32:16. I believe the scriptures teach that "
I know that, WHATSOEVER GOD DOES, IT SHALL BE FOREVER: nothing can be put to it, nor any thing taken from it: and God does it, that men should fear before him". *ECCLESIASTES 3:14
Not everyone, please read HEBREWS 11. Go'ds people in the old covenant were saved the same way as Gods people in the new covenant and that is by faith. The only difference is that they looked forward in faith to the coming of the Messiah through sin offerings, and the ceremonial laws and sacrifices in ordinances and feast days while we look back to the Cross of JESUS and see the lamb of God that takes away the sins of the world *JOHN 1:29; JOHN 1:36.
Yes. this is what it means to be born again to love and is God's new covenant promise of a new heart to love and live in newness of life and walk in God's Spirit *ROMANS 3:31; ROMANS 8:4; GALATIANS 5:16; 1 JOHN 3:6-9; HEBREWS 8:10; ROMANS 13:8-10; MATTHEW 22:36-40; 1 JOHN 2:3-4; REVELATION 14:12; REVELATION 22:14. Sin (breaking God's LAW) is the difference between the children of God and the children of the devil *1 JOHN 3:10. This is the promise of JESUS of salvation by faith in God's Word as written in JOHN 8:31-36. (read the scriptures provided)
God's 4th Commandment is one of God's 10 commandments that give us the KNOWLEDGE of what SIN is when broken *
ROMANS 3:20. According to God's WORD alone, All those who CONTINUE in KNOWN UNREPENTANT SIN will not enter into the KINGDOM of HEAVEN *
HEBREWS 10:26-27 because they reject the gift of God's dear son *
ROMANS 6:23 and count the blood of the covenant an unholy thing *HEBREWS 10:26-39.
All the above however are only a part of the everlasting Gospel as the everlasting Gospel is every word that proceeds out of the mouth of God.
Now do you want to know what is my Gospel of Grace?
Well my Gospel of grace is
JESUS (the Word of God) *JOHN 1:1-4; JOHN 1:14 and every word that proceeds out of the mouth of God *MATTHEW 4:4. His Words are Spirit and his Words of life *JOHN 6:63 and we are to live by every word of God and all scripture that is given by inspiration of God *2 TIMOTHY 3:16. This is my gospel that I am sharing with you my dear brother. It is God's Word and it is indeed good news for all those who have ears to hear and eyes to see the love that God has for us in giving us his only begotten son that who so ever believes in him (the Word) shall not perish but have everlasting life *JOHN 3:16-21. We are saved by GRACE through faith and not of ourselves it is a gift of God *
EPHESIANS 2:8. OBEDIENCE to God's LAW is not how we are saved it is the FRUIT of God's work in us as we BELIEVE and FOLLOW his WORD. If our faith has no fruit it is dead *
JAMES 2:18-20; 26 and our tree will be cast down and thrown into the fire *
MATTHEW 3:10; 7:19-20; 13:49-50. There is no GRACE without God's LAW as it is God's LAW that leads us to God's GRACE that we might be forgiven through faith *GALATIANS 3:22-25 but many do not know the meaning *MATTHEW 9:12-13.
May you receive God's Word and be blessed. Ignoring it does not make it disappear as it will be our judge come judgment day dear brother *JOHN 12:47-48.