Well… my belief (like that of the early Christians prior to the 4th century) is that the Son of God existed from the beginning of time when He was begotten by God. After He was born of Mary, He BECAME fully human as the Anointed Jesus, and was subject to the same weaknesses and strengths as any other human. He got hungry and thirsty like anyone else. He could do no miracles on His own, but the Father performed many miracles through Him.
After God raised Him from the dead, His state was similar to that prior to His incarnation, except that He then had a glorified body, and at one point walked through a closed door. When we are raised to life again, we too, will be able to do things that we cannot now do with our present mortal bodies.
Being a unitarian per se does not imply a disbelief in the deity of Jesus. Even Arius stated that Jesus was “fully God.” Consider his letter to Eusebius in A.D.321.
Letter of Arius to Eusebius, Bishop of Nicomedia ---- A.D. 321
To his dearest lord, the man of God, the faithful and orthodox Eusebius, Arius, unjustly persecuted by Pope Alexander on account of that all-conquering truth which you also champion, sends greetings in the Lord.
Since my father Ammonius is going into Nicomedia, I thought it my duty to salute you by him, and at the same time advise that naturally charitable disposition of yours, which you display towards the brethren for the sake of God and his Christ, how grievously the bishop attacks and persecutes us, and comes full tilt against us, so that he drives us from the city as atheists because we do not concur with him when he publicly preaches, “God always, the Son always; at the same time the Father, at the same time the Son; the Son co-exists with God, unbegotten; he is ever-begotten; he is not born-by-begetting; neither by thought nor by any moment of time does God precede the Son; God always, Son always; the Son exists from God himself.”
Eusebius, your brother Bishop of Caesarea, Theodatus, Paulinus, Athanasius, Gregory, Aetius, and all the other bishops of the east, have been condemned for saying that God existed, without beginning, before the Son; except Philogonius, Hellanicus, and Macarius, men who are heretics and unlearned in the faith; some of whom say that the Son is an effluence, others a projection, others that he is co-unbegotten.
To these impieties we cannot even listen, even though the heretics threaten us with a thousand deaths. But what we say and think we both have taught and continue to teach, that the Son is not unbegotten, nor part of the unbegotten in any way, nor is he derived from any substance; but that by his own will and counsel he existed before times and ages, fully God, only-begotten, unchangeable.
And before he was begotten, or created, or appointed, or established, he did not exist; for he was not unbegotten. We are persecuted because we say that the Son has a beginning, but God is without beginning. For that reason we are persecuted, and because we say that he is from what is not. And this we say because he is neither part of God nor derived from any essence. For this we are persecuted; the rest you know.
I trust, Eusebius, that you are strong in the Lord, mindful of our afflictions, a true fellow-disciple of Lucian.