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 that denieth the Father and the Son: The "liar" is "antichrist," who denies both the Father and the Son. It is impossible to deny one without denying the other. To reject Jesus as the Son of God, the Messiah, is to disavow God also. Jesus says, "He that honoreth not the Son honoreth not the Father which hath sent him" (John 5:23). He further says, "whosoever shall receive me receiveth him that sent me" (Luke 9:48). The only way to God is through Jesus Christ (John 14:6); therefore, to repudiate Jesus is to deny the only means for reaching God. To deny that Jesus is the Son of God is to deny that God is the Father of Jesus.