The word "deny" is defined as a "refusal to admit the truth or existence of [something]" ; "refusal to accept as true or valid"; refusing to give or grant something deserved or desired to someone.
To deny the Son is to refuse the truth of who the Son is. It is to refuse the validity of who the Son is. Simply put, when the Son of God is denied, one refuses God. When the truth of the Son is acknowledged, God is acknowledged.
How does one acknowledge the Son? By Believing Jesus is who he says he is. Yes, by believing Jesus is who God says He is.
God is Spirit and can not bleed. A body was therefore necessary. The body he took on was very much human. In this body He experienced all that we experience. This deemed Him to be our perfect high priest. Hebrews 4:14-16. The body was sinless. It was created by God separately from Adam's blood line just for this purpose-for God himself to completely inhabit it, and shed blood. The body had free will,and thus prayed to it's creator, the Father of all creation. The body since it was created or fathered by God was by definition, the Son of God. Little did anyone know that the presented Son, was the Father in human form.
"that is, that God was in Christ reconciling the world to Himself, not imputing their trespasses to them, and has committed to us the word of reconciliation."- 2 Corinthians 5:19
Only the Father can reveal this mystery- through his Spirit and his Word. Matthew 16:17. But to say this is impossible is to deny the Son. Denying the Son and who He is, is denying the Father and who He is. Is not our God all-powerful, all-knowing, and all-present? Is anything too hard for God? Jeremiah 32:27. Luke 1:37.
Jesus, the express image, is the door to God. He is the bridge. When we believe in Jesus- His deity, His Lordship, His power and His salvation- he springboards us from the natural to the spiritual. We step in natural water but enter a spiritual realm through Jesus, the door. When His name is spoken as we break through that water, our soul is uncursed, and our hearts began a transformation. Our mind is freed from the corrupting virus called sin. Our true foreordained spirit nature begins to unfold.
We become hungry now for the Word of God and His Spirit, through His Word, shows us who He is.
And without controversy of godliness: God was manifested in flesh, Justified in Spirit, Seen by angels, Preached among Gentiles, Believed on in world, Received up in glory. - 1 Timothy 3:16
So why did the apostles letters mention Jesus the Son of God, and the Father, seemingly separately?Simply to bridge the Gap from the Son (God's expression of himself) to the Father. The Son was comprehensible. He wants us to "
And we know that the Son of God has come and has given us an understanding, that we may know Him who is true; and we are in Him who is true, in His Son Jesus Christ. This is the true God and eternal life.- 1 John 5:20
In conclusion, let us take care to acknowledge the Son for all He is- the Father revealed- so we do not fall into the trap of denying him and by default, denying the very God we seek.