That is to seriously diminish what the passage states and ignore the plain and obvious reading of it. Where in the context does it say anything about "the disposition of Jesus' mind in his youth"?
What does it say?
Php 2:5 Have this mind among yourselves, which is yours in Christ Jesus,
Php 2:6 who, though he was in the form of God, did not count equality with God a thing to be grasped,
Php 2:7 but emptied himself, by taking the form of a servant, being born in the likeness of men.
Php 2:8 And being found in human form, he humbled himself by becoming obedient to the point of death, even death on a cross.
Php 2:9 Therefore God has highly exalted him and bestowed on him the name that is above every name,
Php 2:10 so that at the name of Jesus every knee should bow, in heaven and on earth and under the earth,
Php 2:11 and every tongue confess that Jesus Christ is Lord, to the glory of God the Father. (ESV)
Some important points to note about this passage:
1. Jesus was in "the form of God." This is supported by John 1:1--" and the Word was God." The NIV has a clearer rendering of what is meant in verse 6: "being in very nature God." The Expositor's Greek Testament and M. R. Vincent (Word Studies in the New Testament) agree. That Paul is referring to the divinity of Christ is without question.
2. He "did not count equality with God a thing to be grasped"; that is, being in the form of God, being equal with the Father, he did not consider that equality something to be "forcefully retained [or held onto]." The meaning is that anything to do with the appearance of his glory as God had to be let go of or veiled in order for the completion of his humiliation, which was necessary for man's salvation. Again, the NIV brings out the meaning a bit better: "did not consider equality with God something to be used to his own advantage."
3. He, being Jesus, emptied himself. It was he who did the emptying. In other words, he had to already exist in order to be able to be “emptied,” and he had to be sufficiently powerful to do it himself. That is, in contrast with his “taking the form of a servant,” he was something else. He had to be something or someone that was capable of emptying himself. (cf. 2 Cor 8:9)
4. In emptying himself, he took on the "form of a servant, being born in the likeness of men"--this is what John 1:14 is speaking of. First, note that Paul is contrasting Jesus's "taking the form of a servant, being born in the likeness of men" with being in the "form of God." Second, the emptying of himself was accomplished by taking on human form. It’s a paradoxical emptying by addition; a limiting or veiling of his glory and power by becoming human. Jesus willingly chose to take the form of a human for the salvation of mankind and, as God Incarnate, still maintained his full deity (since God can never cease to be God) in becoming truly and fully human.
5. Being found in "appearance as a man" (NIV)--as opposed to his having been in "the form of God." We know that he was truly human, so why would Paul suddenly say that Jesus was "found in appearance as a man"? Would that not imply that he existed previously, supporting verse 6, and indicate he wasn't a man before?
6. He "humbled himself by becoming obedient." This is exactly why he prays to the Father, does the Father's will, and only speaks what he hears. He subjected himself to the law of God and obeyed it perfectly, fulfilling it and becoming the sacrificial "Lamb of God, who takes away the sin of the world" (John 1:29, ESV).
7. He is given “the name that is above every name so that at the name of Jesus every knee should bow. ... and every tongue confess that Jesus Christ is Lord.” This is language used of God:
Isa 45:22 “Turn to me and be saved, all the ends of the earth! For I am God, and there is no other.
Isa 45:23 By myself I have sworn; from my mouth has gone out in righteousness a word that shall not return: ‘To me every knee shall bow, every tongue shall swear allegiance.’ (ESV)
This is why Christians rightly worship Christ as God.
Paul also agrees with John elsewhere:
1Co 8:4 Therefore, as to the eating of food offered to idols, we know that “an idol has no real existence,” and that “there is no God but one.”
1Co 8:5 For although there may be so-called gods in heaven or on earth—as indeed there are many “gods” and many “lords”—
1Co 8:6 yet for us there is one God, the Father, from whom are all things and for whom we exist, and one Lord, Jesus Christ, through whom are all things and through whom we exist. (ESV)
Gal 4:4 But when the fullness of time had come, God sent forth his Son, born of woman, born under the law (ESV)
Col 1:16 For by him all things were created, in heaven and on earth, visible and invisible, whether thrones or dominions or rulers or authorities—all things were created through him and for him.
Col 1:17 And he is before all things, and in him all things hold together. (ESV)
The NT is replete with both explicit and implicit statements of the deity of Jesus. There is simply no way to read the NT and not know that Jesus is both truly God and truly man, apart from denying his deity to begin with and then reinterpret everything to fit.