There are many ways of approaching the subject of God being Jesus. If we spend time considering their relationship as presented in the Scriptures we certainly struggle to reconcile such a teaching as the Trinity.
We all know that God resurrected Jesus Christ from the grave. This in itself begins to define the nature of their relationship; being God the Creator and Jesus Christ the created. You may like to explore the references of God making his son. 2 Cor 5:21 “made or make” Rom 8:3 “likeness or form” and so on, reveals Jesus Christ was reliant on God for his beginning and his resurrection and ascension. If they were "co-equal...co-eternal", as the trinity doctrine states, then we would expect their relationship to be that of equals. However we see Jesus Christ being vastly different "physically" than his Father. We also know that Jesus was reliant of his Father to learn wisdom and that wisdom was not inherently in him. Luke 2:40. We also see the relationship between God and Christ is similar to that of husband and wife:
"The head of every man is Christ; and the head of the woman is the man; and the head of Christ is God" (1 Cor. 11:3).
As the husband is the head of the wife, so God is the head of Christ, although they have the same unity of purpose as should be between a husband and his wife. "Christ is God's" (1 Cor 3:23), as the wife belongs to the husband.
We find in some of the Epistles they introduce us to “God the Father of the Lord Jesus Christ”. The fact that God is described as "the God and Father of our Lord Jesus Christ" (1 Pet. 1:3; Eph 1:17) this is even after Christ's ascension to heaven, which shows that this is now their relationship, as it was during Christ's mortal life.
Revelation, the last book of the New Testament, was written at least 30 years after Christ's glorification and ascension, yet it speaks of God as "his (Christ's) God and Father" (Rev. 1:6 R.V.).
In this book, the resurrected and glorified Christ gave messages to the believers. He speaks of "the temple of my God...the name of my God...the city of my God" (Rev. 3:12). This proves that Jesus even now thinks of the Father as his God and therefore he (Jesus) is not God.
During his mortal life, Jesus related to his Father in a similar way. He spoke of ascending "unto my Father, and your Father; and to my God, and your God" (John 20:17). On the cross, Jesus displayed his humanity to the full: "My God, my God, why hast Thou forsaken me?" (Matt. 27:46). Such words are impossible to understand if spoken by God Himself. The very fact that Jesus prayed to God "with strong crying and tears" in itself indicates the true nature of their relationship (Heb. 5:7; Luke 6:12). God evidently cannot pray to Himself. Even now, Christ prays to God on our behalf (Rom. 8:26,27 cp 2 Cor. 3:18).
In conclusion, a servant does his master's will, and is in no way equal to his master (John 13:16). Christ always recognised what power and authority he had was always from God, rather than in his own right: "I can of mine own self do nothing...I seek...the will of the Father which hath sent me...the Son can do nothing of himself" (John 5:30,19).
Alethos