Therefore, who is Apollos? And who is Paul? But servants through whom we believed, and each as the Lord gave? 1 Corinthians 3:5
We are not to follow men, but God. The Corinthian saints were causing division by claiming to be of Apollos, Paul, or Christ, because they were carnal. Carnal means they were focused on the desires of the flesh, not on Spiritual things. The content of what is taught is important, not the person teaching it. False teachers want us looking at the person and not paying attention to the fruit. They seek to gather people to follow them as they merchandise the saints—using the saints for financial gain. When we stop looking at the person and start focusing on the content, false teachers find it far more difficult to deceive the saints.