Perhaps you would like to read most all of Acts 15. It begins with a controversy because some uninstructed men were teaching that the Gentiles had to be circumcised and this caused strife. So in Jerusalem, there was a meeting to decide what would be done. The result was that the Gentiles would not be troubled with any burden but those stated (and specifically not circumcision).
Acts 15:1 Some men came down from Judea and began teaching the brethren, "Unless you are circumcised according to the custom of Moses, you cannot be saved." 2 And when Paul and Barnabas had great dissension and debate with them, the brethren determined that Paul and Barnabas and some others of them should go up to Jerusalem to the apostles and elders concerning this issue…24 "Since we have heard that some of our number to whom we gave no instruction have disturbed you with their words, unsettling your souls,… 28 … it seemed good to the Holy Spirit and to us to lay upon you no greater burden than these essentials: 29 that you abstain from things sacrificed to idols and from blood and from things strangled and from fornication; if you keep yourselves free from such things, you will do well. Farewell."
At later times, there seems to be a residual conflict over this issue, but Paul teaches that you don’t have to be circumcised to be justified. You can read about the issue in Romans 3 running into Romans 4. These ought to help with a background on the issue, anyway.
Rom 3:28 For we maintain that a man is justified by faith apart from works of the Law. 29 Or is God the God of Jews only? Is He not the God of Gentiles also? Yes, of Gentiles also, 30 since indeed God who will justify the circumcised by faith and the uncircumcised through faith is one.Rom 4:9 Is this blessing then on the circumcised, or on the uncircumcised also? For we say, "FAITH WAS CREDITED TO ABRAHAM AS RIGHTEOUSNESS." 10 How then was it credited? While he was circumcised, or uncircumcised? Not while circumcised, but while uncircumcised;
