The fact that God became flesh is one of the most wonderful and yet one of the most incomprehensible things about God. "And without controversy great is the mystery of godliness: God was manifest in the flesh…". Jesus is like no other man that ever has been or will be. He has two natures; He is fully God and fully man. Most problems in people's minds concerning the Godhead come from this great mystery. They cannot understand the dual nature of Christ and cannot correctly separate his two roles. They cannot comprehend how God could take on the form of a man and live among men.
It is true that we cannot comprehend fully how the miraculous conception - the union of God and man - took place in the womb of Mary, but we can accept it by faith. In fact, if we do not believe that Jesus is come in the flesh we have an antichrist spirit , but if we do accept this doctrine of Christ we will have both the Father and the Son. Both Father and Son are revealed in Christ.
The mystery of God in flesh was a great stumbling block to the Jews. They never could understand how Jesus, being a man, could also be God. Because He claimed to be God they rejected Him and sought to kill Him. They tried to limit God by their own preconceived ideas of how God should act.
Even today, many Jews cannot accept Jesus for this reason.
Isaiah 7:14, 9:6, Jeremiah 23:6, and Micah 5:2 to show that the Messiah would be Jehovah God. There never has been a mystery as to "persons" in the Godhead. The Bible clearly states that there is only one God, and this is easy for all to understand. The title "Son of God" simply means God manifested in the flesh. From the Bible we see that Jesus Christ had two distinct natures in a way that no other human being has ever had. One nature is human or fleshly; the other nature is divine or Spirit. Jesus was both fully man and fully God. The name Jesus refers to the eternal Spirit of God (the Father) dwelling in the flesh.
The primary purpose of the Son is to be our Savior. The work of salvation required many roles that only a human being could fulfill, including the roles of sacrifice, propitiation, substitute, kinsman-redeemer reconciler, mediator, advocate, high priest, second Adam, and example. These terms overlap in many ways, but each represents an important aspect of the work of salvation that, according to the plan of God, could only be done by a human being.
According to God's plan, the shedding of blood was necessary for the remission of man's sins. The blood of animals could not take away man's sin because animals are inferior to man. No other human could purchase redemption for someone else because all had sinned and so deserved the penalty of death for themselves. Only God was sinless, but He did not have flesh and blood. Therefore, God prepared a body for Himself, that He might live a sinless life in flesh and shed innocent blood to save mankind. He became flesh and blood so that He could through death defeat the devil and deliver mankind. Through His humanity Jesus is the second Adam. He came to conquer and condemn sin in the flesh and to defeat death itself. He came as a man so that He could replace Adam as the representative of the human race. By so doing, He reversed all the consequences of Adam's fall for those who believe on Him. Everything that mankind lost because of Adam's sin, Jesus won it back as the second Adam, the new representative of the human race.