1 Corinthians 3:4–5 (KJV 1900)
4 For while one saith, I am of Paul; and another, I am of Apollos; are ye not carnal?
5 Who then is Paul, and who is Apollos, but ministers by whom ye believed, even as the Lord gave to every man?
Paul reviews the original problem he was addressing from chapter one. The contentions in the church were tearing it apart. They were consumed with pride over which man they followed. Paul says, when you do this, you are carnal.
Men are not the message. Men are ministers, or servants of the One who gave the Corinthians salvation. Men may guide others to the cross, but it is the Lord who saves.