According to Paul in Ephesians, there’s no place for a division in the Christian church. While I don’t get the impression the Ephesians were actually divided, I have little doubt that division was possible, maybe even probable.
Regardless, Paul wants the Gentiles to understand their rightful place in the church. He also wants them to avoid any temptation to cause schisms in the body of Christ. As he told the Colossians:
There is not Greek and Jew, circumcised and uncircumcised … but Christ is all, and in all.
Put on then, as God’s chosen ones, holy and beloved, compassionate hearts, kindness, humility, meekness, and patience, bearing with one another and, if one has a complaint against another, forgiving each other; as the Lord has forgiven you, so you also must forgive. And above all these put on love, which binds everything together in perfect harmony. And let the peace of Christ rule in your hearts, to which indeed you were called in one body. And be thankful. (Colossians 3:11-15)
Let’s not forget what it is we believe as Christians. The gospel of Jesus Christ is the good news of reconciliation. First and foremost, we are reconciled to God. Second, we are reconciled to God’s people. There is only one faith and one body.