Who is the liar but he who denies that Jesus is the Christ? This is the Antichrist, he who denies the Father and the Son.
He is Antichrist He speaks not of that prince of defection who was to occupy the seat of God; but all those who seek to overthrow Christ, he puts them among that impious band. And that he might amplify their crime, he asserts that the Father, no less than the Son, is denied by them; as though he had said, “They have no longer any religion, because they wholly cast away God.” And this he afterwards confirms, by adding this reason, that the Father cannot be separated from the Son. 