last part:
And how could we know whether he is acting with his divine or his human nature?
this is called the hypostatic union related to the Incarnation… the union of the 2 natures…the “how” is beyond our comprehension, just as we don’t know how God manages to be omnipotent or onipresent. When it comes to the “how”, i don’t think you will have answers because when we understand, we will understand God’s omnipotence, which is impossible.

A diplomatic answer, but this is not what I want. I need a yes/no answer. Is the human nature God or not?
no it is not a diplomatic answer as Jesus is the Word incarnate. Your question pertains to the hypostatic union, and hence to the incarnation, the Divine Word took.
But wait a minute, what do you mean by saying that Jesus didn’t become God?
i meant that neither is God a man, nor did Jesus become God when previously He wasn’t.
Well, the word mother is well known to have the meaning of leadership in many languages, while the word set up must mean that there is a subject and an object, that one wasn’t set up then he was, the Bible could have used other words which also used in many languages, for example it could have said " I was with God from the beginning". The same as using the word “pocessed” which means that the father owns the son.
what you suggested are used in the same context:
Proverbs 8:22-30 The LORD **possessed **me in the beginning of his way, before his works of old. I was
set up from everlasting, from the beginning.
John 1:1 In the beginning was the Word, and the Word was with God, and the Word was God.
It may mean eternally existing but it can’t mean eternally begotten as he mentioned begetting after this sentence, I have even read an early father before saying that God used to have the word in his belly, then when he wanted to create all things he begot him, but unfortunately, I couldn’t remember the source exactly.
the source is theophilus as well

to beget :
verb 1. (Old-fashioned) cause, bring, produce, create, effect, lead to, occasion, result in, generate, provoke, induce, bring about, give rise to, precipitate, incite, engender
verb 2. father, breed, generate, sire, get, propagate, procreate
I don’t actually know where Jesus said so, he didn’t differentiate between a Jew and a gentile concerning this issue, this is Paul. But anyways, I will go with you till the end, if a Jew living now converted to Christianity, should he abide to the OT laws?
if he wishes so, but not with the intent of salvation ,as the Judaizers insisted and which prompted the apostles to reply to them , but in light of what Jesus taught and did, and the same applies to a gentile who wishes to abide by the law, he can if he wishes, but not as a means for salvation, as Jesus fulfills the law and gives salvation to the circumcised and uncircumcized…
But the Scripture imprisoned everything under sin, so that the promise by faith in Jesus Christ might be given to those who believe. Now before faith came, we were held captive under the law, imprisoned until the coming faith would be revealed.
So then, the law was our guardian until Christ came, in order that we might be justified by faith. But now that faith has come, we are no longer under a guardian," Galatians 3:19-25
“Behold, the days are coming, declares the LORD,
when I will make a new covenant with the house of Israel and the house of Judah, not like the covenant that I made with their fathers on the day when I took them by the hand to bring them out of the land of Egypt, my covenant that they broke, though I was their husband, declares the LORD. But this is the covenant that I will make with the house of Israel after those days, declares the LORD: I will put my law within them, and I will write it on their hearts. And I will be their God, and they shall be my people. And no longer shall each one teach his neighbor and each his brother, saying, ‘Know the LORD,’ for they shall all know me, from the least of them to the greatest, declares the LORD. For I will forgive their iniquity, and I will remember their sin no more.” Jeremiah 31:31-34