Some have argued that the title ‘God Most High’ belongs to the Son as well as the Father; a simple examination of the subject will show us that is not the case:
The title ‘Most High’ denotes supremacy; being above all others. When applied to the title ‘God’, it denotes the Supreme God, the God Who is above all else. We must consider that such a title is not a sharable or communicable title, but is exclusive; it cannot be possessed by more than one person, as it is only possible for one person to be above all others, absolutely. If two persons were to be considered equal, neither would individually be ‘Most High’, as neither would be above the other; so only one person can be ‘Most High’. Only the person Who is supreme above all else absolutely can be fittingly called ‘God Most High’.
It should be obvious that this person, this God, is the Father, and no other. He alone is the Supreme Being (see Five Simple Proofs That the Father Alone Is the Supreme Being). The Son is not equal to Him, but declared that “the Father is greater than I” (Jn 14:28). The Son everywhere declares that He is another besides His Father, that He lives because of His Father, and that He is always subject to His Father and does nothing on His own initiative. And so it is clear that the Father, not the Son, is the Most High God, as He alone is supreme over all absolutely.
We may also note that the scriptures, as we should expect, reserve this title for the Father alone, and use it as a title for Him in contradistinction to the Son:
“He will be great and will be called the Son of the Most High; and the Lord God will give Him the throne of His father David” (Luke 1:32 NASB)
“Seeing Jesus, he cried out and fell before Him, and said in a loud voice, “What business do we have with each other, Jesus, Son of the Most High God? I beg You, do not torment me.” (Luke 8:28 NASB)
Finally its worth noting that if the title were applied to the Son, due to its exclusive nature, one would not be declaring the Son equal to the Father, but greater than the Father. For, to again reiterate, the title ‘Most High’ is an exclusive and incommunicable title, which denotes the one Who is above all others absolutely. When we apply the title ‘Most High’ to someone, we declare that they are above everyone else. If, therefore, one were to say that the Son were ‘God Most High’, this would be to say that the Son is greater than even the Father, and that He is supreme over Him. Thus Origen rightly said:
“Grant that there may be some individuals among the multitudes of believers who are not in entire agreement with us, and who incautiously assert that the Saviour is the Most High God; however, we do not hold with them, but rather believe Him when He says, “The Father who sent Me is greater than I.” We would not therefore make Him whom we call Father inferior — as Celsus accuses us of doing — to the Son of God.” (Contra Celsum, 8.14)
We can see there that Origen employs the same logic as above; that since the title ‘Most High’ denotes absolute supremacy above all, calling the Son ‘God Most High’ would be to falsely assert that He is supreme over and greater than the Father; when in truth, the Father is Supreme over all, and greater than the Son. Thus the scriptures and all reason compel us to ascribe the title of ‘God Most High’ to one only, the God and Father of the Lord Jesus Christ, “the only true God” (Jn 17:3).