There are many things that are not clear in my mind. Concerning the Law and the Prophets, Jesus said that the Law and the Prophet (pretty much the whole Bible) may not be changed;
Brother, we humans cannot change anything because we are "blind guides" to the way out of sin as expressed by Jesus in the following passage.
“What sorrow awaits you teachers of religious law and you Pharisees. Hypocrites! For you shut the door of the Kingdom of Heaven in people’s faces. You won’t go in yourselves, and you don’t let others enter either. “What sorrow awaits you teachers of religious law and you Pharisees. Hypocrites! For you cross land and sea to make one convert, and then you turn that person into twice the child of hell you yourselves are! “Blind guides! What sorrow awaits you! For you say that it means nothing to swear ‘by God’s Temple,’ but that it is binding to swear ‘by the gold in the Temple.’ Blind fools! Which is more important—the gold or the Temple that makes the gold sacred? And you say that to swear ‘by the altar’ is not binding, but to swear ‘by the gifts on the altar’ is binding. How blind! For which is more important—the gift on the altar or the altar that makes the gift sacred? When you swear ‘by the altar,’ you are swearing by it and by everything on it. And when you swear ‘by the Temple,’ you are swearing by it and by God, who lives in it. And when you swear ‘by heaven,’ you are swearing by the throne of God and by God, who sits on the throne. (Matthew 23:13-22 NLT)
When we change something, as was done in Judaism by adding human traditions that cancel the word of God, as revealed in this next passage, these human traditions enslave us in sin that would otherwise have been removed by God's Ten Commandments had these human traditions not been added to Judaism.
Jesus replied, “You hypocrites! Isaiah was right when he prophesied about you, for he wrote, ‘These people honor me with their lips, but their hearts are far from me. Their worship is a farce, for they teach man-made ideas as commandments from God.’ For you ignore God’s law(nomos)/commandment(entolé) and substitute your own tradition.” Then he said, “You skillfully sidestep God’s law(nomos)/commandment(entolé) in order to hold on to your own tradition. For instance, Moses gave you this law(nomos)/commandment(entolé) from God: ‘Honor your father and mother,’ and ‘Anyone who speaks disrespectfully of father or mother must be put to death.’ But you say it is all right for people to say to their parents, ‘Sorry, I can’t help you. For I have vowed to give to God what I would have given to you.’ In this way, you let them disregard their needy parents. And so you cancel the word of God in order to hand down your own tradition. And this is only one example among many others.” (Mark 7:6-13 NLT fixed)
Jesus never mentioned circumcision, had the lost sheep of Israel and Judah discontinued circumcision he would have mentioned it.
Jesus did tell us about a change in who does the "circumcision" through Paul in Colossians. There are many things that Jesus told us through Paul that He was unable to tell us himself because we could not "bear" them at the time Jesus was with us. Jesus speaks to us by passing the message on to the Holy Spirit, who gives us the message guaranteed through the prophets and not directly to non-prophets where the Holy Spirit is silent as revealed in this passage.
“There is so much more I want to tell you, but you can’t bear it now. When the Spirit of truth comes, he will guide you into all truth. He will not speak on his own but will tell you what he has heard. He will tell you about the future. He will bring me glory by telling you whatever he receives from me. All that belongs to the Father is mine; this is why I said, ‘The Spirit will tell you whatever he receives from me.’ (John 16:12-15 NLT)
Many have used the silence of the Holy Spirit to defend the human tradition of Sunday in place of the Sabbath when we need to find the truth of the Sabbath in the guaranteed word of God in the Bible and not demand that the Holy Spirit speaks to us personally what He has given us through the guaranteed word of God in the Bible to listen to in Hebrews, chapter 4.
Now if Joshua had succeeded in giving them this rest, God would not have spoken about another day of rest still to come. (Hebrews 4:8 NLT)
You allow Paul to change the Law without blinking an eye.
Paul has not changed the law as many assume by not letting Paul define his own terms when he speaks of replacing the law with the "Spirit" as superior in Jesus' obedience as our "Spirit" role model, instead of Judaism's disobedience to the Ten Commandments written in stone. Paul can add things because he speaks as a prophet for God, called to give messages to the church in the following passage. However, he can not change what has been said by prophets before him or that would disqualify him as a prophet of God.
Now get to your feet! For I have appeared to you to appoint you as my servant and witness. Tell people that you have seen me, and tell them what I will show you in the future. (Acts 26:16 NLT)
United in our hope for the soon return of Jesus, Jorge