Everyone must continue to follow only the teaching about Christ. Whoever changes that teaching does not have God. But whoever continues to follow the teaching about Christ has both the Father and his Son.
If I had not come and spoken to the people of the world, they would not be guilty of sin. But now I have spoken to them. So they have no excuse for their sin.
I did things among the people of the world that no one else has ever done. If I had not done those things, they would not be guilty of sin. But they have seen what I did, and still they hate me and my Father.