God is not lacking anything. By definition, God cannot lack one single thing and still be God. Yet, the Scriptures reveal there are many things which Jesus lacks.

Omniscience

Trinitarians actually have the audacity to claim Jesus was omniscient despite the utterly plain facts the Bible tells us that he increased in wisdom and he himself declared only his Father knew the day and hour of his return. One must ask why they would appeal to such dishonest measures.

And Jesus was increasing in wisdom and stature, and in favor with God and men. (Luke 2:52).

But of that day and hour no one knows, not even the angels of heaven, nor the Son, but the Father only. (Matthew 24:36).

Omnipotence

Trinitarians actually have the audacity to claim Jesus was omnipotent despite the utterly plain fact the Bible tells us that he lives by the power of God and that only God possess immortality within himself and he needed God to save him from death. God the Father lives by the power of his own inherent immortality. However, Jesus lives by the power of his Father's immortality.

For indeed He was crucified because of weakness, yet He lives out of the power of God (2 Corinthians 13:4).

I charge you in the sight of God who gives life to all, and of Christ Jesus, who testified the good confession before Pontius Pilate, that you keep the commandment spotless and irreproachable until the appearing of our Lord Jesus Christ, which in his own time he will show the Blessed and only Sovereign Power, the King of Kings and Lord of Lords, who alone possesses immortality and dwells in unapproachable light, whom no man has seen or can see. To Him be honor and eternal might! Amen (1 Timothy 6:14-16).

He offered up both prayers and supplications with loud crying and tears to the One able to save Him from death, and He was heard because of His piety. (Hebrews 5:7).

His Existence is Dependent on the Father

God is not a begotten being. The Son of God is a begotten being. It matters not how anyone defines the word "begotten." The fact will still remain that Jesus is begotten and God the Father is not. God the Father is unbegotten. He is sourced in nobody else. His existence is dependent on no other identity. On the other hand, Jesus is begotten. He is sourced in the Father. His existence is dependent on the Father. God's existence is dependent on no one.

He was not the Creator

The Bible never once indicates Jesus created the universe. It does however indicate he is the Word of God and that God created the universe by means of his Word. Every occurrence that mentions Jesus in conjunction with creation says that God created "through" or "by means of" his Word. God is the Creator by definition. Jesus was the Word of God, that is, the means by which God had created. If you are not the Creator you are not God.

He has a Lord and God

God does not have a Lord or God over him. By definition God cannot have any authority above him or he wouldn't be God. The Scriptures plainly show that Jesus has a Lord and God and still has a Lord and God. God has no authority above him. He is the top authority and power of all that exists. This is not true of Jesus. The Son of God is subject to his Father and always will be. Jesus has a God, his Father.