To disprove your post, all I need do is find one instance where this is not true.
Your above in bold, is true. However, your above underlined, you are attempting to slide Gentiles back under the rug of the 10 commandments.
I am speaking about the Mosaic Law, not just the Ten Commandments. It is by the Mosaic Law that we have knowledge of what sin is (Romans 3:20), so the position that Gentiles don't need to obey it is the position that Gentiles don't need salvation from sin.
Jesus primarily taught in the temples to the Jews. Jesus' audience was the Jews. Jesus said he came to fulfill the laws. Make them more complete.
To fulfill the law means "to cause God's will (as made known through the law) to be obeyed as it should be" (NAS Greek Lexicon: pleroo). After Jesus said that he came to fulfill the law, he then proceeded to fulfill the law six times throughout the rest of the chapter by teaching how to correctly obey it as it should be.
Paul primarily taught to the Gentiles. Paul said he was the most zealous of the laws. Paul used the laws as a bases for teaching. Not for keeping. Else he would have taught circumcision.
Paul did not have the authority to countermand God, so he only spoke against circumcision for incorrect purposes. In Acts 15:1, men from Judea were wanting to require all Gentiles to become circumcised in order to become saved, however, that was never the purpose for which God commanded circumcision, so the Jerusalem Council upheld God's law by correctly ruling against requiring circumcision for an incorrect purpose.
Jesus is our High Priest. Neither Paul nor Jesus obeyed the Sabbath as a law. If your own High Priest is not obeying OT Law. Why are you calling for it to still be adhered to as Law? It is now an example.
But I will continue.
Both Paul and Jesus continued to obey the Sabbath. In Acts 21:20-24, Paul took steps to disprove false rumors that he was teaching against God's law and to show that he continued to live in obedience to it. Sin is the transgression of God's law (1 John 3:4), so for you to claim that Jesus did not obey it is to claim that he sinned and therefore to deny that he is our Savior.
The laws are fulfilled in the two commandments. Love God. Love your neighbor. Jesus said so.
You are performing a Salvation + works concept, where the Two Commandments are enough, but you are trying to slide not circumcision, but the 'Law' back into New Wine requirements. That is another gospel.
Everything commanded in the Mosaic Law is in regard to how to love our neighbor and/or God, so love fulfills the Mosaic Law because is it showing a correct understanding of how to obey it as it should be.
Again, living in obedience to God's law through faith in Jesus is intrinsically the content of the gift of him saving us from not l living in obedience to it and Titus 2:11-13 describes the gift of our salvation as being trained by grace to do those works.
Jesus gave the parable about new and old wine skins to answer a question about why his disciples weren't fasting, so you are apply what he said in a way that has nothing to do with answering that question.
The greatest two commandments implies that there are still other commandments that are not the greatest two. If the greatest two commandments were enough, then God could have just given those two commandments in the first place, but clearly other commanded were needed to flesh out what it means to correctly obey the greatest two.
The Gospel that Jesus taught called for our repentance from our disobedience to the Mosaic Law and in Romans 15:18-19, Paul fulfilled the Gospel by bringing Gentiles to obedience to it in word and in deed, so you are saying that the Gospel that Jesus and Paul taught is another Gospel.
There was no law. There was no sin.
Adam sinned. God drove them out of the garden and put heavy burdens on Adam and Eve.
Then Caine murdered Able. More sin. And God drove Able out. No great punishment for murder. Caine cried and complained. These days Caine would be on death row. That is a very lenient sentence. Because God never wants people to die before choosing salvation in Jesus. OT Law is now a barrier to people trying to understand Salvation and their responsibilities. It is 100% correct to say that Jesus commands that you Love God and Love your Neighbor. And it is 100% correct to not teach the Law after that.
Satan worked hard to bring the world to evil, with Angels attempting to dilute the population by mating with women in an attempt to prevent the Christ from coming.
To Satans delight, the world was flooded. Noah and his family were preserved.
The Noahide Laws:
1. Do not deny God (no idolatry).
2. Do not murder.
3. Do not steal.
4. Do not engage in sexual immorality.
5. Do not blaspheme.
6. Do not eat of a live animal (no eating flesh taken from an animal while it is still alive).
7. Establish courts and legal systems to ensure obedience of these laws.
According to Jewish tradition, the first six of these seven laws were given to Adam in the Garden of Eden (the sixth law, to not eat live animals, was extraneous, since Adam did not eat any animals). When God established His covenant with Noah, He added the seventh (and the sixth became applicable). Each of the seven Noahide Laws is seen as a summary of more detailed laws, about 211 total.
So the Laws were given long before the 10 commandments. The 10 commandments were for the lost Hebrews. For them only.
When The Christ was born, even through all of Satan's attempts to subvert mankind, a change was coming. Jesus was that change. And now instead of a cold or harsh law of do not do bad things, we have a loving law of telling us to Love.
It really is that simple.
Peace and Blessings
Sin is what is contrary to God nature, God's nature is eternal, and God's law was given to divide what is in accordance with or contrary to God's nature, such as as with righteousness being in accordance with God's nature and unrighteousness being sin, which is why God's righteousness and all of His righteous laws are eternal (Psalms 119:142, 119:160). There are many examples of God's laws being given prior to Sinai, such as in Genesis 4:7, God told cain that sin was crouching at the door and that he must master it and the fact that he was concerned about being avenged and was given protection rather than a death sentence shows that he was found guilty of committing accidental manslaughter in accordance with what would later instructed in Deuteronomy 19 rather than guilty of committing murder.
In Deuteronomy 4:2, it is a sin to add to or subtract from the law, so Jesus did not make any changes to it. In Matthew 22:36-40, Jesus was not asked about which were the only commandments that we should still follow, but about which was the greatest commandments, and the greatest two commandments are the greatest two because they are inclusive of all of the other commandments. Again, if we love God and our neighbor, then we won't commit adultery, idolatry, theft, murder, kidnapping, rape, favoritism, and so forth for the rest of the Mosaic Law, so that is not making a change to the law.
God did not give a cold and harsh law, but rather His law was given for our own good in order to bless us (Deuteronomy 6:24, 10:12-13). David said repeatedly throughout the Psalms that he loved God's law and delighted in obeying it, so if we consider the Psalms to be Scripture and to therefore express a correct view of God's law, then we will share it Paul did (Romans 7:22) while anything less than the view that we ought to delight in obeying it is incompatible with the view that the Psalms are Scripture. For example, in Psalms 1:1-2, blessed are those who delight in the Law and the Lord and who meditate on it day and night, so we can't believe in the truth of these words while not allowing them to shape our view of the Mosaic Law and they are incompatible with viewing it as being cold and harsh.