Acts 21:19-21

Catholics are still governed by many rules, including circumcision, originating  with the Jewish converts to Christianity.

The Catholic Church, also known as the Roman Catholic Church, is the largest Christian Church, with more than 1.29 billion members worldwide.As one of the oldest religious institutions in the world, it has played a prominent role in the history and development of Western civilisation. Roman Catholicism maintains that the Roman Catholic Church was established by Christ through the Apostle Peter as the first visible head. 

This is based on Matthew 16:18, when JESUS CHRIST said to Peter, "And I tell you that you are Peter, and on this rock I will build my church, and the gates of Hades will not overcome it." (NIV)

The evidence of how God changed the lives of Gentiles was presented to the Christians in Jerusalem. The strongest evidence was the Gentile believers themselves who had accompanied Paul to Jerusalem. At this time, Paul may have also given the money he had been collecting from the Gentile Christians. The love the Gentiles expressed to their suffering Jewish brethren was a mark of their genuine conversion.

Reports were circulating that Paul had been urging Jews to abandon Mosaic traditions. However, Paul never derided his Jewish heritage nor demanded that Jewish Christians renounce the Law of Moses. He only made it clear to everyone that the law could not function as a means of salvation. There is evidence that Paul was continuing to keep the Law when he stood before Felix. The fact that he was coming to Jerusalem to worship was evidence of this. What Paul did resist was any attempt to force Gentiles to become Jews. Salvation was through faith alone. Relying on adherence to the Jewish law was repudiation of the gospel message that salvation proceeds from faith in Christ and that alone. The NKJV Study Bible 

Some Jewish people in Jerusalem believed incorrectly that Paul was discouraging Jews from keeping the law. This was not true, since Paul himself continued to observe Jewish customs. Faithlife Study Bible

Acts 21:19–21 (NKJV)

¹⁹ When he had greeted them, he told in detail those things which God had done among the Gentiles through his ministry. ²⁰ And when they heard it, they glorified the Lord. And they said to him, “You see, brother, how many myriads of Jews there are who have believed, and they are all zealous for the law; ²¹ but they have been informed about you that you teach all the Jews who are among the Gentiles to forsake Moses, saying that they ought not to circumcise their children nor to walk according to the customs.