God is God of all people. So too, Christ is the Messiah and King of all people.
Firstly Abraham Wasn’t even A Jew .
The “seed” of David was actually prophesied, by the LORD, to righteous Abraham as Abraham’s seed. “22:15 And the angel of the LORD called unto Abraham out of heaven the second time, 22:16 And said, By myself have I sworn, saith the LORD, for because thou hast done this thing, and hast not withheld thy son, thine only son: 22:17 That in blessing I will bless thee, and in multiplying I will multiply thy seed as the stars of the heaven, and as the sand which is upon the sea shore; and thy seed shall possess the gate of his enemies; 22:18 And in thy seed shall all the nations of the earth be blessed; because thou hast obeyed my voice.” (Genesis 22:15-18 KJV)
Seventeen verses in the New Testament describe Jesus as the “son of David”.
“A record of the genealogy of Jesus Christ THE SON OF DAVID, the son of Abraham: Abraham was the father of Isaac, Isaac the father of Jacob, Jacob the father of Judah and his brothers, Judah the father of Perez and Zerah, whose mother was Tamar, Perez the father of Hezron, Hezron the father of Ram, Ram the father of Amminadab, Amminadab the father of Nahshon, Nahshon the father of Salmon, Salmon the father of Boaz, whose mother was Rahab, Boaz the father of Obed, whose mother was Ruth, Obed the father of Jesse, and Jesse the father of King David. David was the father of Solomon, whose mother had been Uriah’s wife, Solomon the father of Rehoboam, Rehoboam the father of Abijah, Abijah the father of Asa, Asa the father of Jehoshaphat, Jehoshaphat the father of Jehoram, Jehoram the father of Uzziah, Uzziah the father of Jotham, Jotham the father of Ahaz, Ahaz the father of Hezekiah, Hezekiah the father of Manasseh, Manasseh the father of Amon, Amon the father of Josiah, and Josiah the father of Jeconiah and his brothers at the time of the exile to Babylon. After the exile to Babylon: Jeconiah was the father of Shealtiel, Shealtiel the father of Zerubbabel, Zerubbabel the father of Abiud, Abiud the father of Eliakim, Eliakim the father of Azor, Azor the father of Zadok, Zadok the father of Akim, Akim the father of Eliud, Eliud the father of Eleazar, Eleazar the father of Matthan, Matthan the father of Jacob, and Jacob the father of Joseph, the husband of Mary, of whom was born Jesus, who is called Christ. Thus there were fourteen generations in all from Abraham to David, fourteen from David to the exile to Babylon, and fourteen from the exile to the Christ. 11:36 And unto his son will I give one tribe, that David my servant may have a light alway before me in Jerusalem, the city which I have chosen me to put my name there. 11:37 And I will take thee, and thou shalt reign according to all that thy soul desireth, and shalt be king over Israel. 11:38 And it shall be, if thou wilt hearken unto all that I command thee, and wilt walk in my ways, and do that is right in my sight, to keep my statutes and my commandments, as David my servant did; that I will be with thee, and build thee a sure house, as I built for David, and will give Israel unto thee. 11:39 And I will for this afflict the seed of David, but not for ever.” (1 Kings 11:36-39 KJV)
33:22 As the host of heaven cannot be numbered, neither the sand of the sea measured: so will I multiply the seed of David my servant, and the Levites that minister unto me. Jeremiah 33:
This is how the birth of Jesus Christ came about: His mother Mary was pledged to be married to Joseph, but before they came together, she was found to be with child through the Holy Spirit. Because Joseph her husband was a righteous man and did not want to expose her to public disgrace, he had in mind to divorce her quietly. But after he had considered this, an angel of the Lord appeared to him in a dream and said, ‘Joseph SON OF DAVID, do not be afraid to take Mary home as your wife, because what is conceived in her is from the Holy Spirit.’” Matthew 1:1-20
“The angel went to her and said, ‘Greetings, you who are highly favored! The Lord is with you.’ Mary was greatly troubled at his words and wondered what kind of greeting this might be. But the angel said to her, ‘Do not be afraid, Mary, you have found favor with God. You will be with child and give birth to a son, and you are to give him the name Jesus. He will be great and will be called the Son of the Most High. The Lord God will give him the throne of HIS FATHER DAVID, and he will reign over the house of Jacob forever; his kingdom will never end.’ ‘How will this be,’ Mary asked the angel, ‘since I am a virgin?’ The angel answered, ‘The Holy Spirit will come upon you, and the power of the Most High will overshadow you. So the holy one to be born will be called the Son of God.’” Luke 1:28-35
Romans 1: 3 Concerning his Son Jesus Christ our Lord, which was made 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:
John 1:14 The Word became flesh and made His dwelling among us. We have seen His glory, the glory of the one and only Son from the Father, full of grace and truth.
Joseph was not the father of Jesus; God was. Jesus is the human aspect of the offspring of David. Before that, Jesus was spirit. As the Son of God in spirit form, Jesus created all things John 1: 1 In the beginning was the Word, and the Word was with God, and the Word was God. 2 The same was in the beginning with God. 3 All things were made by him; and without him was not any thing made that was made.
Jesus created all things, including humanity, as one of the persons of the Godhead before He was flesh and blood. It was only after Mary gave birth to Him that Jesus became flesh and blood. Jesus truly had a human ancestry from his mother’s side which linked him to King David and to the Patriarchs:
The Messianic prophecies foretold of Jesus the Son of God as coming in the flesh, as the offspring of a woman. So Jesus, the Word, became flesh John 1:11 He came unto his own, and his own received him not. 12 But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name: 13 Which were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God.14 And the Word was made flesh, and dwelt among us, (and we beheld his glory, the glory as of the only begotten of the Father,) full of grace and truth.
“Then one of the elders said to me, ‘Do not weep! See, the Lion of the tribe OF JUDAH, THE ROOT OF DAVID, has triumphed. He is able to open the scroll and its seven seals.’” Revelation 5:5
Revelation 22:16, I Jesus have sent mine angel to testify unto you these things in the churches. I am the root and the offspring of David, and the bright and morning star.
“Then they came to Jericho. As Jesus and his disciples, together with a large crowd, were leaving the city, a blind man, Bartimaeus (that is, the Son of Timaeus), was sitting by the roadside begging. When he heard that it was Jesus of Nazareth, he began to shout, ‘Jesus, Son of David, have mercy on me!’ Many rebuked him and told him to be quiet, but he shouted all the more, ‘Son of David, have mercy on me!’” Mark 10:46-48
“David said about him: ‘I saw the Lord always before me. Because he is at my right hand, I will not be shaken. Therefore my heart is glad and my tongue rejoices; my body also will live in hope, because you will not abandon me to the grave, nor will you let your Holy One see decay. You have made known to me the paths of life; you will fill me with joy in your presence.’ Brothers, I can tell you confidently that the patriarch David died and was buried, and his tomb is here to this day. But he was a prophet and knew that God had promised him on oath that he would place ONE OF HIS DESCENDANTS on his throne. Seeing what was ahead, he spoke of the resurrection of the Christ, that he was not abandoned to the grave, nor did his body see decay.” Acts 2:25-31
“Remember Jesus Christ, raised from the dead, descended from David. This is my gospel …” 2 Timothy 2:8
Galatians 3:16 Now the promises were spoken to Abraham and to his seed He does not say, “And to seeds,” as referring to many, but rather to one, “And to your seed,” that is, Christ.
Romans 4:13 For the promise that Abraham would be heir of the world was not made to him and his descendants through the Law, but through the righteousness that comes by faith.
Galatians 3:22 But the scripture hath concluded all under sin, that the promise by faith of Jesus Christ might be given to them that believe. 23 But before faith came, we were kept under the law, shut up unto the faith which should afterwards be revealed. 24 Wherefore the law was our schoolmaster to bring us unto Christ, that we might be justified by faith. 25 But after that faith is come, we are no longer under a schoolmaster. 26 For ye are all the children of God by faith in Christ Jesus. 27 For as many of you as have been baptized into Christ have put on Christ. 28 There is neither Jew nor Greek, there is neither bond nor free, there is neither male nor female: for ye are all one in Christ Jesus. 29 And if ye be Christ’s, then are ye Abraham’s seed, and heirs according to the promise.
Galatians 3: 7 Know ye therefore that they which are of faith, the same are the children of Abraham. 8 And the scripture, foreseeing that God would justify the heathen through faith, preached before the gospel unto Abraham, saying, In thee shall all nations be blessed. 9 So then they which be of faith are blessed with faithful Abraham. 10 For as many as are of the works of the law are under the curse: for it is written, Cursed is every one that continueth not in all things which are written in the book of the law to do them. 11 But that no man is justified by the law in the sight of God, it is evident: for, The just shall live by faith. 12 And the law is not of faith: but, The man that doeth them shall live in them. 13 Christ hath redeemed us from the curse of the law, being made a curse for us: for it is written, Cursed is every one that hangeth on a tree: 14 That the blessing of Abraham might come on the Gentiles through Jesus Christ; that we might receive the promise of the Spirit through faith. 15 Brethren, I speak after the manner of men; Though it be but a man’s covenant, yet if it be confirmed, no man disannulleth, or addeth thereto. 16 Now to Abraham and his seed were the promises made. He saith not, And to seeds, as of many; but as of one, And to thy seed, which is Christ.
Hebrews 12:22 But ye are come unto mount Sion, and unto the city of the living God, the heavenly Jerusalem, and to an innumerable company of angels, 23 To the general assembly and church of the firstborn, which are written in heaven, and to God the Judge of all, and to the spirits of just men made perfect, 24 And to Jesus the mediator of the new covenant, and to the blood of sprinkling, that speaketh better things than that of Abel. 25 See that ye refuse not him that speaketh. For if they escaped not who refused him that spake on earth, much more shall not we escape, if we turn away from him that speaketh from heaven:
Acts 3:25 And you are sons of the prophets and of the covenant God made with your fathers, when He said to Abraham, ‘Through your offspring all the families of the earth will be blessed.’
1 Corinthians 3:23 and you belong to Christ, and Christ belongs to God.
Galatians 4:28 Now you, brothers, like Isaac, are children of the promise.
Ephesians 3:6 This mystery is that through the gospel the Gentiles are fellow heirs, fellow members of the body, and fellow partakers of the promise in Christ Jesus.
Galatians 4:7,28 Why you are no more a servant, but a son; and if a son, then an heir
Revelation 21:7 He that overcomes shall inherit all things; and I will be his God, …
2 Timothy 2:7-11 Consider what I say, for the Lord will give you understanding in everything. 8 Remember Jesus Christ, risen from the dead, descendant of David, according to my gospel, 9 for which I suffer hardship even to imprisonment as a criminal; but the word of God is not imprisoned. 10 For this reason I endure all things for the sake of those who are chosen, so that they also may obtain the salvation which is in Christ Jesus and with it eternal glory. 11 It is a trustworthy statement: For if we died with Him, we will also live with Him.