I can't understand why Paul was so opposed to it. Surely Jehovah and Jesus knew best?
YHVH, Jesus Christ, Paul, and Peter, as well as all other true Christians are in agreement.
Circumcision of the heart is what is important in God's eyes, not fleshly circumcision, just as being a spiritual "Jew" is what is important in God's eyes, not being a fleshly Jew.
Perhaps you forgot these Scriptures?
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"Circumcise, then the foreskin of your heart, and do not be stubborn any longer. For the Lord your God is God of gods and Lord of lords, the great God, mighty and awesome, who is not partial and takes no bribe, who executes justice for the orphan and the widow and who loves the strangers, providing them with food and clothing" -Deut. 10:16-18
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Acts 10
Cornelius Calls for Peter
1At Caesarea there was a man named Cornelius, a centurion in what was known as the Italian Regiment. 2He and all his family were devout and God-fearing; he gave generously to those in need and prayed to God regularly. 3One day at about three in the afternoon he had a vision. He distinctly saw an angel of God, who came to him and said, "Cornelius!"
4Cornelius stared at him in fear. "What is it, Lord?" he asked.
The angel answered, "Your prayers and gifts to the poor have come up as a memorial offering before God. 5Now send men to Joppa to bring back a man named Simon who is called Peter. 6He is staying with Simon the tanner, whose house is by the sea."
7When the angel who spoke to him had gone, Cornelius called two of his servants and a devout soldier who was one of his attendants. 8He told them everything that had happened and sent them to Joppa.
Peter's Vision
9About noon the following day as they were on their journey and approaching the city, Peter went up on the roof to pray. 10He became hungry and wanted something to eat, and while the meal was being prepared, he fell into a trance. 11He saw heaven opened and something like a large sheet being let down to earth by its four corners. 12It contained all kinds of four-footed animals, as well as reptiles of the earth and birds of the air. 13Then a voice told him, "Get up, Peter. Kill and eat."
14"Surely not, Lord!" Peter replied. "I have never eaten anything impure or unclean."
15The voice spoke to him a second time, "Do not call anything impure that God has made clean."
16This happened three times, and immediately the sheet was taken back to heaven.
17While Peter was wondering about the meaning of the vision, the men sent by Cornelius found out where Simon's house was and stopped at the gate. 18They called out, asking if Simon who was known as Peter was staying there.
19While Peter was still thinking about the vision, the Spirit said to him, "Simon, three[a] men are looking for you. 20So get up and go downstairs. Do not hesitate to go with them, for I have sent them."
21Peter went down and said to the men, "I'm the one you're looking for. Why have you come?"
22The men replied, "We have come from Cornelius the centurion. He is a righteous and God-fearing man, who is respected by all the Jewish people. A holy angel told him to have you come to his house so that he could hear what you have to say." 23Then Peter invited the men into the house to be his guests.
Peter at Cornelius' House
The next day Peter started out with them, and some of the brothers from Joppa went along. 24The following day he arrived in Caesarea. Cornelius was expecting them and had called together his relatives and close friends. 25As Peter entered the house, Cornelius met him and fell at his feet in reverence. 26But Peter made him get up. "Stand up," he said, "I am only a man myself."
27Talking with him, Peter went inside and found a large gathering of people. 28He said to them: "You are well aware that it is against our law for a Jew to associate with a Gentile or visit him. But God has shown me that I should not call any man impure or unclean. 29So when I was sent for, I came without raising any objection. May I ask why you sent for me?"
30Cornelius answered: "Four days ago I was in my house praying at this hour, at three in the afternoon. Suddenly a man in shining clothes stood before me 31and said, 'Cornelius, God has heard your prayer and remembered your gifts to the poor. 32Send to Joppa for Simon who is called Peter. He is a guest in the home of Simon the tanner, who lives by the sea.' 33So I sent for you immediately, and it was good of you to come. Now we are all here in the presence of God to listen to everything the Lord has commanded you to tell us."
34Then Peter began to speak: "I now realize how true it is that God does not show favoritism 35but accepts men from every nation who fear him and do what is right. 36You know the message God sent to the people of Israel, telling the good news of peace through Jesus Christ, who is Lord of all. 37You know what has happened throughout Judea, beginning in Galilee after the baptism that John preached— 38how God anointed Jesus of Nazareth with the Holy Spirit and power, and how he went around doing good and healing all who were under the power of the devil, because God was with him.
39"We are witnesses of everything he did in the country of the Jews and in Jerusalem. They killed him by hanging him on a tree, 40but God raised him from the dead on the third day and caused him to be seen. 41He was not seen by all the people, but by witnesses whom God had already chosen—by us who ate and drank with him after he rose from the dead. 42He commanded us to preach to the people and to testify that he is the one whom God appointed as judge of the living and the dead. 43All the prophets testify about him that everyone who believes in him receives forgiveness of sins through his name."
44While Peter was still speaking these words, the Holy Spirit came on all who heard the message. 45The circumcised believers who had come with Peter were astonished that the gift of the Holy Spirit had been poured out even on the Gentiles. 46For they heard them speaking in tongues[b] and praising God.
Then Peter said, 47"Can anyone keep these people from being baptized with water? They have received the Holy Spirit just as we have." 48So he ordered that they be baptized in the name of Jesus Christ. Then they asked Peter to stay with them for a few days.
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8 If you really keep the royal law found in Scripture, "Love your neighbor as yourself," [ a ] you are doing right. 9 But if you show favoritism, you sin and are convicted by the law as lawbreakers. 10 For whoever keeps the whole law and yet stumbles at just one point is guilty of breaking all of it. 11 For he who said, "Do not commit adultery," [ b ] also said, "Do not murder." [ c ] If you do not commit adultery but do commit murder, you have become a lawbreaker. " 12 Speak and act as those who are going to be judged by the law that gives freedom, 13 because judgment without mercy will be shown to anyone who has not been merciful. Mercy triumphs over judgment!" -James 2:8-13
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Galatians 3
Faith or Observance of the Law
1 You foolish Galatians! Who has bewitched you? Before your very eyes Jesus Christ was clearly portrayed as crucified. 2 I would like to learn just one thing from you: Did you receive the Spirit by observing the law, or by believing what you heard? 3 Are you so foolish? After beginning with the Spirit, are you now trying to attain your goal by human effort? 4 Have you suffered so much for nothing—if it really was for nothing? 5 Does God give you his Spirit and work miracles among you because you observe the law, or because you believe what you heard?
6 Consider Abraham: "He believed God, and it was credited to him as righteousness." [ a ] 7 Understand, then, that those who believe are children of Abraham. 8 The Scripture foresaw that God would justify the Gentiles by faith, and announced the gospel in advance to Abraham: "All nations will be blessed through you." [ b ] 9 So those who have faith are blessed along with Abraham, the man of faith.
10 All who rely on observing the law are under a curse, for it is written: "Cursed is everyone who does not continue to do everything written in the Book of the Law." [ c ] 11 Clearly no one is justified before God by the law, because, "The righteous will live by faith." [ d ] 12 The law is not based on faith; on the contrary, "The man who does these things will live by them." [ e ] 13 Christ redeemed us from the curse of the law by becoming a curse for us, for it is written: "Cursed is everyone who is hung on a tree." [ f ] 14 He redeemed us in order that the blessing given to Abraham might come to the Gentiles through Christ Jesus, so that by faith we might receive the promise of the Spirit.
The Law and the Promise
15 Brothers, let me take an example from everyday life. Just as no one can set aside or add to a human covenant that has been duly established, so it is in this case. 16 The promises were spoken to Abraham and to his seed. The Scripture does not say "and to seeds," meaning many people, but "and to your seed," [ g ] meaning one person, who is Christ. 17 What I mean is this: The law, introduced 430 years later, does not set aside the covenant previously established by God and thus do away with the promise. 18 For if the inheritance depends on the law, then it no longer depends on a promise; but God in his grace gave it to Abraham through a promise.
19 What, then, was the purpose of the law? It was added because of transgressions until the Seed to whom the promise referred had come. The law was put into effect through angels by a mediator. 20 A mediator, however, does not represent just one party; but God is one.
21 Is the law, therefore, opposed to the promises of God? Absolutely not! For if a law had been given that could impart life, then righteousness would certainly have come by the law. 22 But the Scripture declares that the whole world is a prisoner of sin, so that what was promised, being given through faith in Jesus Christ, might be given to those who believe.
23 Before this faith came, we were held prisoners by the law, locked up until faith should be revealed. 24 So the law was put in charge to lead us to Christ [ h ] that we might be justified by faith. 25 Now that faith has come, we are no longer under the supervision of the law.
Sons of God
26 You are all sons of God through faith in Christ Jesus, 27 for all of you who were baptized into Christ have clothed yourselves with Christ. 28 There is neither Jew nor Greek, slave nor free, male nor female, for you are all one in Christ Jesus. 29 If you belong to Christ, then you are Abraham's seed, and heirs according to the promise.
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"know that a man is not justified by observing the law, but by faith in Jesus Christ. So we, too, have put our faith in Christ Jesus that we may be justified by faith in Christ and not by observing the law, because by observing the law no one will be justified." -Galatians 2:16
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BA - True Christians have no need to observe the Christ-fulfilled Mosaic Laws, as Christ has shown us a better way, putting Faith in God, His son, and the redeeming power of His sacrifice, and living by the Law of Love:
"37 Jesus replied: " 'Love the Lord your God with all your heart and with all your soul and with all your mind.' [ a ] 38 This is the first and greatest commandment. 39 And the second is like it: 'Love your neighbor as yourself.' [ b ] 40 All the Law and the Prophets hang on these two commandments." -Matthew 22:37-40
