I could deal with his straw-man conversation about a throne room conversation, which begs a question raised in one of the last statements made in the next to last paragraph:
So it makes you wonder about Jesus’ famous lamenation in Matthew 27:46:
About the ninth hour Jesus cried out in a loud voice, “Eloi, Eloi, lama sabachthani?”—which means, “My God, my God, why have you forsaken me?”
Since Jesus is God, what he really must have meant is: “Myself, myself, why have I forsaken me?” Which of course makes absolutely no sense.
Marshall’s entire argument hinges around a misunderstanding of the nature of the Christian concept of God: that God exists as three Persons in one Being. In other words, God exists as a Triune being. The best way to explain it is that there is the Being of God and that being is shared by three co-equal, co-eternal persons: God the Father is not God the Son, nor is God the Father God the Spirit, nor is God the Son the Spirit, nor is the Spirt the Father or Son, they are three distinct persons possessing one being that is God. Dr. James White tackles that issue in this message on the Trinity.
So, when Jesus, who is the incarnate Second Person of God, quotes the Psalmist in Matthew 27:46, and says, “My God, my God! Why have You forsaken Me?” He is speaking to His Father, who is the First Person of God, using words inspired by the Third Person of God. It doesn’t make sense unless you understand what is being presented.
I think this passage from John’s gospel will help with any confusion:
And the Word became flesh and dwelt among us, and we have seen his glory, glory as of the only Son from the Father, full of grace and truth…. For from his fullness we have all received, grace upon grace. For the law was given through Moses; grace and truth came through Jesus Christ. No one has ever seen God; the only God, who is at the Father’s side, he has made him known. (1:14,16-18 ESV, emphasis mine).