How do we know that there's no division in the body of Christ?

In 1 Corinthians 1:13, Paul poses the rhetorical questions, 'Is Christ divided? Was Paul crucified for you? Were you baptized in the name of Paul?' These questions emphasize that the foundation of the church is not based on human leaders but on Christ Himself. Believers are all baptized into one body by one Spirit, regardless of their individual preferences or allegiances to church leaders. The unity of the church reflects the unity of the Trinity, where all believers share in the same spiritual life and identity. By recognizing that Christ is the head of the body, the church can avoid divisions that detract from the gospel and the mission of the church.