Nonsense, you are pretty much IGNORING the intent of the council of Jerusalem why would they DEMAND circumcision of gentiles to begin with if it was MEANINGLESS to the Law itself? The logic of this thinking is absent.
Acts 15:1 But some men came down from Judea and were teaching the brothers, “Unless you are circumcised according to the custom of Moses, you cannot be saved.”
Their intent was to require Gentiles to become circumcised and obey the customs of Moses in order be saved, which is certainly related to the law insofar as it is their traditions, customs, interpretation, or understanding of how to obey it, but it was nevertheless something Jesus came against. He accused them of setting aside the law to follow their own traditions (Mark 7:6-13) and of tying up heavy burdens that wouldn't lift a finger to move (Matthew 23:4). So the issue raised in Acts 15 was about whether Gentiles had to keep Jewish customs about how to obey the law in order to be saved, not whether obeying God's commands is part of the Christian walk. They were expected to learn about Moses in the synagogues every Sabbath, it is straightforward that they were still expect to learn about how to obey God, just not according to Jewish customs.
We must obey God rather than man, so if God had said in His law that all Gentiles need to become circumcised and the Jerusalem Council had said that Gentiles don't need to become circumcised, then we must obey God instead of the Jerusalem Council, but God never said that and the Jerusalem Council upheld God's law by correctly ruling that it does not require that. God does require those Gentiles in the household of Abraham and those who want to eat of the Passover lamb to become circumcised (Genesis 17:12, Exodus 12:48), but He does not command all Gentiles everywhere to become circumcised and He certainly does not require it in order to become saved. The Jerusalem Council had no authority to countermand God or to add to or subtract from His commands (Deuteronomy 4:2), so did not and could not tell Gentiles that it was ok to sin and disobey God.
Gentiles are not grafted into Israel, more nonsense. Foreigners who "attached" themselves to Israel became by circumcision Israelites or they were not allowed to partake of the covenant of Israel (the Law).
In other words you are spouting a bunch of false statements here.
According to Ephesians 2:12, Gentiles were once separated from Messiah, alienated from Israel, strangers to the covenants of promise, and without a hope, but through faith in Messiah all of that is no longer true, and in Ephesians 2:19 they are no longer strangers or aliens, but are now fellow citizens of Israel along with the saints. According to 1 Peter 2:9-10, Gentiles are now part of God's chosen people, a royal priesthood, a holy nation, and a treasure of God's own possession, all of which was once said about Israel (Deuteronomy 7:6), so are now being included as part of Israel. The New Covenant was only made with the house of Israel and the house of Judah (Jeremiah 31:31), so if someone is not grafted into Israel by faith in Messiah, then they are not part of the New Covenant. Furthermore, the New Covenant involves God's law being written on our hearts (Jeremiah 31:33) so that we will obey it.
God has always been holy, righteous, and good, so He has always had such a conduct, and His law is holy, righteous, and good (Romans 7:12) because it is a reflection of God's character and it is His instructions for how to have such a conduct. So the way have such a conduct and act in line with God's character has existed from the beginning and exists independently of any covenant, and did not change between covenants. Even if God had made no covenants with man, it would still be to our advantage to have a holy, righteous, and good conduct, and indeed we are also told to have such a conduct as part of the New Covenant.
Jesus never commanded ANY non Jews to keep the Law, Jesus never instructed Paul to teach Gentiles to keep the Law. You are arguing from SILENCE and will continue to do so the New Testament has plenty of content that if you were correct in your assertions would be 100% obvious, in your face, and outright out front proclaiming by TEACHING of direct commanding to keep the Law when in fact one must use prestidigitation to acquire such knowledge.
Jesus hardly interacted with non-Jews, which is itself an argument from silence. We know that both Jesus and Paul told people not to sin and sin is lawlessness (1 John 3:4), so telling Gentiles not to sin is the same thing as telling them not to break God's law. I don't think it gets more straightforward than that. Furthermore, Jesus taught how to obey the law both by word and by example and Gentiles are told to follow his example and to walk as he walked. Our sanctification is about being made to be like him in also having a holy, righteous, and good conduct in accordance with the law.