“If we receive the witness of men, the witness of God is greater; for this is the witness of God which He has testified of His Son. 10 He who believes in the Son of God has the witness in himself; he who does not believe God has made Him a liar, because he has not believed the testimony that God has given of His Son. 11 And this is the testimony: that God has given us eternal life, and this life is in His Son. 12 He who has the Son has life; he who does not have the Son of God does not have life.” (1 John 5:9-12 NKJV)
The truth laid out in these verses is simple- he who has the Son has life; he who does not believe in the Son of God, does not have life. Salvation comes through Jesus Christ, the one Mediator between God and man (1 Tim 2:5), and no one comes to the Father except through Him (John 14:6).
To believe that Jesus Christ is the Son of God, then, is manifestly required for salvation. The confession that Jesus is “the Christ, the Son of the living God” is central to the true Christian faith (Matt 16:16).
Yet tragically, many professing Christians deny the Son of God. They do this by embracing Augustinian trinitarianism.
Surely such a statement must seem shocking to many. But consider this- if one believes that the Lord Jesus Christ is the Supreme God, the one God, the Almighty, rather than His Son, then a person does not truly believe that Jesus Christ is the Son of God.
You see, to believe that Jesus Christ is the Son of God requires more than that we simply repeat the words “Son of God”. We must believe what scripture means by the phrase, or it profits us nothing. And scripturally, the Son of God is a distinct individual from the one God, the Supreme God, the Father. To believe that Jesus Christ is the Son of God requires us to believe that He is a different person than the God whose Son He is.
Most modern trinitarians simply do not believe this. They are quick to confess their faith that Jesus Christ is not the Father, but the Son of the Father; yet by denying the identity of the one God with the person of the Father, their confession that Christ is the Son of the Father does not equate to a confession of Him as the Son of God.
Rather, they view the one God as the Trinity of three ‘persons’. This Trinity is, in their thinking, the one God, the Supreme God, the Almighty. This person is the Father, Son, and Holy Spirit. The problems with this anti-scriptural view are manifold; but one of the most alarming is that it severely alters the relationship of the Son with God. Rather than the Son being the Son of God, and a distinct person from Him, this view presents the Son as part of God -a person out of three who is the one God- rather than the Son of God.
This view is still able to maintain the Son’s identity as Son of the Father, since within this “tri-personal God” the ‘person’ of the Son relates to the ‘person’ of the Father as a distinguishable entity, which is begotten by the Father. Thus a Father-Son distinction is maintained, at least at a certain limited level. But since the God is not synonymous with the Father in this view, this in no way equals believing that Christ is the Son of God. This Father-Son distinction is all deemed to be “within God”. Thus the Lord Jesus Christ is confessed to be the Son of the Father, yet denied to be the Son of God.
This all stems from the root problem of denying the historic first article of the Christian faith- that there is “one God, the Father Almighty”, as so many ancient creeds begin. Both the scriptures and the Christians of the first several centuries of church history are clear in stating the identity of the one God with the Father (see here). As Paul the apostle wrote, “For us there is one God, the Father, from Whom are all things” (1 Cor 8:6). And the Lord Jesus Christ defined eternal life, saying “this is eternal life, that they may know You [the Father], the only true God, and Jesus Christ whom You have sent.” (John 17:3 NKJV).
Those then who deny that the one God is the Father Almighty in particular, set themselves not only at odds with classical Christianity as seen in the writings of the church fathers, but more importantly deny a central truth taught by the holy scriptures. In doing so God’s glory is obscured, and the church is harmed, being deprived of important truth. But worse still, such a denial ultimately results in a denial of the basic and necessary Christian doctrine that Jesus Christ is the Son of God.
Augustinian trinitarianism, then, or semi-modalism, as I prefer to call it, is not simply some innocuous error. It does not only work against the glory of God and the good of His people- it is, if held sincerely, a damnable denial of the Christian faith, by constituting a denial of Christ Himself. By denying the identity of the Father and the Supreme God, the one God, the Almighty, this heresy makes Jesus Christ out to not truly be the Son of God, but merely a part of His own self. Confessing that Jesus is the Son of the Father is not enough- He must be believed in as the Son of God. “And this is the testimony: that God has given us eternal life, and this life is in His Son. 12 He who has the Son has life; he who does not have the Son of God does not have life.” (1 John 5:9-12 NKJV)