He is the Divine Logos, the Eternal Son of the Father,
He was both of these long before any promises were made unto Abraham.
born of Mary. He's a Person.
Of Course. son of man in the lineage of David.
Galatians 4:4 But when the fullness of the time had come,
God sent forth His Son,
born of a woman, born under the law.
Romans 1:
3 concerning His Son Jesus Christ our Lord,
who was born of the seed of David according
to the flesh,
4 and declared to be the Son of God with power according to the Spirit of holiness,
by the resurrection from the dead.
Now He is the ascended God man, and head of all in Christ, His body. Literally. the body of Christ.
All united in one Spirit.
Ephesians 4:4 There is one body and one Spirit, just as you were called in one hope of your calling.
1 Corinthians 12:13 For by one Spirit we were all baptized into one body—whether Jews or Greeks, whether slaves or free—and have all been made to drink into one Spirit.
1 Corinthians 6:17 But he who is joined to the Lord is one spirit
with Him.
As @Davy already pointed out:
Galatians 3:
15 Brethren, I speak in the manner of men:
Though it is only a man’s covenant,
yet
if it is confirmed, no one annuls or adds to it.
16 Now to Abraham and his Seed were the promises made. He does not say,
“And to seeds,” as of many, but as of one, “And to your Seed,” who is Christ.
The Christ, as the seed of Abraham's promise, pertains only to man, and is
"the spirits of just men made perfect." Hebrews 12:23
Who do you think was perfected at the cross, the Son of God, or the Christ-Spirit
of just men to fulfill the promise made to Abraham?
Hebrews 5:
7 who, in the days of His flesh, when He had offered up prayers and supplications,
with vehement cries and tears to Him who was able to save Him from death, and was heard
because of His godly fear,
8 though He was a Son, yet He learned obedience by the things which He suffered.
9 And
having been perfected,
He became the author of eternal salvation to all who obey Him.
The Son, Christ Jesus is the head, the church is the body, Christ is Spirit
2 Corinthians 5:16 Therefore, from now on,
we regard no one according to the flesh.
Even though we have known Christ according to the flesh,
yet now we know Him thus no longer.