The birth of Jesus was God’s entrance to the world in human form as foretold by prophet Isaiah, he announced;
[Isaiah 9:6] For to us a child is born, to us a son is given, and the government will be on his shoulders. And he will be called Wonderful Counselor, Mighty God, Everlasting Father, Prince of Peace.
[Isaiah 7:14]: Therefore the Lord himself will give you a sign: The virgin will be with child and will give birth to a son, and will call him Immanuel (God with us).
Roughly 700 years before Jesus, prophet Isaiah predicted the coming of a Son. He will be born to a virgin woman and will be called Mighty God or everlasting Father. The prophecies above was fulfilled in Mary, angel Gabriel said to her;
[Luke 1:30-32] So the angel told her, “Do not be afraid, Mary, for you have found favor with God. Behold, you will conceive and give birth to a son, and you shall 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.
The first couple fell to sin, thus death entered the world. Mankind became separated from the glory of God. The Holy Spirit that clothed them and gave them eternal life left them. Only sinless or holy man can wear the clothes of eternal life. God searched for a perfect man among us to be the savior of mankind, but found no one (Isaiah 59:16 & Romans 3:10). Because of His great love, God put the saving work in His hand. It is man who sinned therefore it is also man will save himself. This is the reason why God raised a human being and took a power of His spirit to dwell in this man [Deuteronomy 18:18 & John 14:10]. Jesus’ human flesh has a beginning, but His Spirit has no beginning and end because his spirit is a portion of God’s spirit. Jesus declared that He has no beginning and end;
[John 8:58] Jesus said to them, “Truly, truly, I say to you, before Abraham was born, I AM”
[John 8:23-24] “You are from below; I am from above. You are of this world; I am not of this world. I told you that you would die in your sins; if you do not believe that I AM HE, you will indeed die in your sins.”
[John 13:19] “I am telling you now before it happens, so that when it does happen you will believe that I AM WHO I AM.
Jesus took the name of God of Abraham in John (8:23-24 & John 13:19), Compare these verses to (Isaiah 43:10 & Exodus 3:13-14);
[Exodus 3:13-14] “If I come to the people of Israel and say to them, ‘The God of your fathers has sent me to you,’ and they ask me, ‘What is his name?’ what shall I say to them?” God said to Moses, “I AM WHO I AM.” And he said, “Say this to the people of Israel, ‘I AM has sent me to you’.
[Isaiah 43:10] “You are my witnesses,” declares the LORD, “and my servant whom I have chosen, so that you may know and believe me and understand that I AM HE. Before me no god was formed, nor will there be one after me.
“I AM, I AM HE, or I AM WHO I AM”, is the title of God mentioned in the Bible. It speaks His self-existence; that He has no beginning and end, that He is the First and the Last, ever the same.
The savior must be a perfect man, that’s why Jesus though also God, did not use His divine power to His advantage (Philippians 2:6), instead He use His humanity in following the Law of God for humans. If Jesus had used His power to bypass the law, how could He be a perfect man? How could he be righteous? And how could His work be a saving sacrifice for humankind?