He cant be a God and a human at the same time.
Being a human means you have limitations and you are mortal while being God means you have no limitations and you are immortal so unless you explain to us how is it logically posible to have limitations and non limitations at the same being in the same time and how somebody can be mortal and immortal at the same time then yes God can not become a human being, why would he btw?
The doctrine of trinity is fraud at itself and you dont need islam or judaism to prove it right. Yaani usitegemee eti kwa kukuta makosa kwenye uislamu basi ndio ukristo unakuwa sahihi. Hapana, even if you take islamu and all this dhul qarnayn outta picture you still got to explain how is trinity possible. Proof from the book the bible, proof from history from the earliest believers were they trinitarian? and proof from reasoning like how is three Gods become one God logically.
When we are saying YAHWEY are we refering to both father son and holy spirit? If so how do you explain Genesis 19:24 when Yahwey rained sodom and gomora with fire from Yahwey in heaven?
First how did you know how to end-up in only three spirits of God? Why not more? Any clear evidence? In 1timothy 15:21 there is God, christ and angels and in Revelation 1:4 speaks about God, Christ and 7 spirits now how do you know how many Gods are in that 1 complex that trinity talks about?
In jonh's gospel word of God became Jesus who is also God, if jesus speaks what is his words become?
When jesus prayed while he was on earth who was he praying to? Father or Holy spirit? And does that mean Jesus is a lesser God than the two?
It is easier to fall on the heresy when you talk about trinity. For instance when you think of God as he revealed himself in three different forms throughout the history sometimes like father sometimes like son sometimes like holy spirit then you are falling into a modelism which is heresy. If you think of the three as too distincted beings then you are falling into tritheisim which also is heresy. So either you are this or that way.
When talking about Jesus Christians are required to believe that jesus is God and man at the same time and everything he does is both God and Man doing now when you jump in and say So if jesus died then God died they'll say no God did not die and this time they are separating the two which they shouldn't be doing since it is also heresy.