You are greatly mistaken! Christ is God. Jesus had two minds, his physical mind that "grew" in Wisdom, and his spiritual mind which knew ALL things. When Jesus said, "I can of my own self do nothing.." Jesus was speaking from his human nature, which included his physical mind. When Jesus said, "I and my father are one..." he was speaking from his divine nature which included his spiritual mind. Jesus is the name of the physical man, and Christ was God in Jesus. He was a God / man. We do not have the mind of Jesus, we have the mind of Christ who is God!!!! Christ is not Jesus's last name, it is his title.
I believe it is you who are 'greatly mistaken.'
You say firstly, "Christ is God" you then go on to say, "Christ is not Jesus's last name,
it is his title"
Christ which means more or less 'anointed of God' is indeed Jesus' title or commission and not His surname.
So the phrase 'Jesus Christ' is maybe better stated as 'Jesus as the Christ of God', but that is a bit long winded.
Now I do not think that God, (the Father) is just a title (Christ). Surely you can see that 'God' the Father is more, ever so much more than just a title?
So now the 'mind of Christ' must be more correctly understood as 'the mind of the anointed one of God', not the 'mind of God' (the Father).
Now please consider anew (without the use of bold text) ,
1Cor 2:16. "For who has understood the mind of the Lord so as to instruct him?" But we have the mind of Christ.
IMO the translation of the conjunction 'δέ' as 'but' is misleading when taken in isolation as are so many things in the Scriptures.
v16 comes at the ending, not the beginning of what Paul is saying on the matter.
Now look at some of those things Paul is saying leading up v16...
1Cor 2:11. For who knows a person's thoughts except the spirit of that person, which is in him? So also no one comprehends the thoughts of God except the Spirit of God.
How is it that we have the audacity to say we have the mind of God? The Spirit of God comprehends the thoughts (the mind) of God not us.
1Co 2:12 Now we have received not the spirit of the world, but the Spirit who is from God, that we might understand the things freely given us by God.
Having received the Spirit who is from God, we are supposed to understand those things freely given us by God, but we are limited to those things that are freely given to us; not the the whole mind of God.
So, having the mind of Christ, the mind of a servant.................
Php 2:4. Let each of you look not only to his own interests, but also to the interests of others.
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.
Having 'the mind of Christ' has nothing whatsoever to do with having the mind of God.
But if you are determined to believe that the mind of the anointed of God the Father is the same as the mind of God the Father, then there is really nothing more I or anyone else can say.