People continue to attempt to define God on their own terms. They cannot understand or grasp the concept of a Triune God so they make up some explanation that seems reasonable to them. One thing I know for sure is that we will never understand the Trinity while we are in these fallen vessels. We can kinda-sorta explain His existence as three distinct Persons who share One Essence but comprehend fully is a fool’s task. The Trinity is something that true Christians accept on faith because our feeble minds will never understand the whole mystery of God’s eternal state of existence.
We cannot deny the Trinity and continue to be identified as Christians or followers of the King of kings and Lord of Lords, Jesus Christ, the Son of the Living God. Like all essential doctrines we must believe in the Trinity. We must believe that Jesus is the Son of the Living God, the Second Person of the Trinity, the very Son of the Holy Father. This is something that we cannot get wrong. We must understand God as He has shown Himself to be.
If we deny that God exists as a Triune God then we have to reject that Jesus is also God and that the Holy Spirit exists. Declaring that Jesus is the Son of God born into creation as a man, of a virgin, is essential to the gospel. To claim that Jesus was born an ordinary man and was somehow picked to be the Savior of the world is nullify His sacrifice and the propitiation He supplied for our sins. He had to be all of God and all of man for the sake of the eternal security of the elect.
And the Holy Spirit’s ministry would not nonexistent. He would simply be a ghost, a reference to something we hope exists but doesn’t. The Holy Spirit is the third Person of the Trinity and that has to be necessary for us. The Spirit could not fulfill His ministry to us if He was not part of the Trinity. We would be aimless and fumbling about in this world (some people are who claim to know Christ) as we try to figure out what the death of Jesus means. We would have no hope because the Holy Spirit is the One who brings hope to our hearts and minds as we wallow in this corrupt quagmire of our world.
A belief in the Trinity is necessary to a solid grounding in the gospel and is necessary for us to fully enjoy the benefits of being called an adopted child of the Almighty Living God who created us.