Paul was concern with people keeping the practices ( Genesis 17: 9-13) of the (Type) like Abrahams circumcision, after G-d's own circumcision was finished. G-d's flesh (anti-type) being cut off the living G-d and dieing on the cross. Because G-d's flesh died, circumcision of the male foreskin is no longer need. Now instead of looking forward as Abraham did, we can look back and see a clearer picture of Jesus being cutoff by His living heavenly Father and dieing, the Circumcised of G-d. If we keep on with circumcision of the male forskin for symbolic reasons, we would be denying Jesus was the Circumcised of G-d, then we would have to look forward for another. That is what Paul was opposed to.
According to Isaiah 45:25, all Israel will be saved, so a number of Jews incorrectly thought that meant Gentile had to become Jewish proselytes in order to become saved, which meant going through the process of circumcision, and which meant joining the group of people who agreed at Sinai to do everything that Moses said (Exodus 20:19, Deuteronomy 5:22-28). Moses had the power to make authoritative interpretations of the Torah and by the 1st century those who had this power passed down them were referred to as sitting in sitting in Moses' seat (Matthew 23:2-4) and it had become a large body of rabbinic oral laws, rulings, traditions, and fences that would later be recorded in the Mishna. So by agreeing to become circumcised, Gentiles were agree to become Jews and to live as Jews according to all of the oral laws of the Pharisees that Jesus referred to as a heavy burden, and doing all that in order to become saved.
Circumcision was required as a sign of the covenant, at no point does God's Law ever require it for all Gentiles everywhere, and not even Jews were required to become circumcised for the specific purpose of becoming saved, so by rejecting that man-made requirement in Acts 15:1, the Jerusalem Council was upholding God's Law. So nothing in regard to circumcision changed with respect to Jesus' death on the cross. If someone became circumcised for the purpose become saved, then they would have been fundamentally misunderstanding and perverting the purpose of circumcision, and they would be rejecting salvation by faith, so would be denying Christ, but that does not mean that that circumcision should not be done for its intended purpose.
Paul said that circumcision had much value in every way (Romans 3:1-2), that circumcision had no value, but what mattered was keeping God's commands (1 Corinthians 7:19), and that circumcision has value if you obey God's Law (Romans 2:25), so the issue is that the value of circumcision is entirely dependent on whether you obey God's Law. The way to tell that a Gentile has a circumcised heart is by observing their obedience to the Torah (Romans 2:26), which is the same as it was for Jews (Deuteronomy 30:6).
Not forgetting the understanding of how Type produced an image as though looking through a darken mirror of the Anti-type that we can clearly see. Thankfully Jesus is clearly G-d made into flesh that died in our place on the cross. If we don't understand Jewish knowledge we will never understand Jesus, and G-d's plan from the beginning of time. The Angel Gabriel told Daniel in chapter 9 first 25 to 26 the anointed one Jesus would be cut off and be put to death in the middle of the week, then in 27 told the end of sacifices which is a type of Jesus the anti-type. When type kiss anti-type there is no longer any reason to sacifice or have circumcision. Islam and the Jewish community still look forward so they continue to circumcise male babies, but we can look back at how G-d has already cut off His living flesh that became a symbol of our sinfulness to die, so we can join in the Resurrection of our Saviour who is no longer dead but risen forever more.
I had all three of my son's circumcised because of my lack of knowledge on this subject. In Islam girls are circumcised also because of a lack of understanding why their father Abraham had Ishmael circumsized.
The Anti-Christ is the man of Torah-lessness and he will put a stop the the offerings being made in the third temple, which implies that they will need resume before they can be stopped. In Acts 18:18, Paul took a Nazarite vow, which involved making offering (Numbers 6) and in Acts 21:20-24, he was on in his way to join in the purification rites of those who had taken a similar vow in order to disprove a false rumor that he taught against God's Law to show that he continued to live in obedience to it. Furthermore, Ezekiel 40-46 prophecies a time when offerings will resumed during Messiah's reign. So offerings did not stop at Messiah's death and resurrection, but only because there was no longer a temple in which to do them.