In Chapter 3, Paul warns the Philippians about those Christians who insist that circumcision is necessary for salvation. Circumcision is the removal of skin from the male sex organ for religious reasons. It is practiced by Jews and Muslims. He testifies that he once was a strong follower of this and other Jewish laws, but he now considers these things to be like trash compared to the gospel of Jesus. He says that being right with God comes from faith in Jesus and not by keeping religious laws.