Jesus Christ is called The Son of Man and The Son of God because He is both human and Divine.
“For unto us a child is born, unto us a son is given…” (Isaiah 9:6).
The child that was born was the Son of Man, whereas the Son that was given was the Eternal Son of God, the Christ.
His Divine Self, the Eternal Christ, the Word of God, is from and of eternity past. He is the only Begotten Son of the Heavenly Father. He co-existed with God the Father as the Divine Word.
“In the beginning was the Word, and the Word was with God, and the Word was God. The same was in the beginning with God” (John 1:1-2).
“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” (John 1:14).
The Begotten Son dwelt in the bosom of the Father, equal with God, totally one, totally united.
“No man hath seen God at any time; the only begotten Son, which is in the bosom of the Father, he hath declared him” (John 1:18).
“Let this mind be in you, which was also in Christ Jesus: Who, being in the form of God, thought it not robbery to be equal with God: But made himself of no reputation, and took upon him the form of a servant, and was made in the likeness of men: And being found in fashion as a man, he humbled himself, and became obedient unto death, even the death of the cross” (Philippians 2:5-8).
The Divine Word of God, God’s Son, the Christ, became human flesh, conceived in the womb of the Virgin Mary, so that He could become the Redeemer of all mankind and through Him, grant man eternal life.
“Behold, a virgin shall be with child, and shall bring forth a son, and they shall call his name Emmanuel, which being interpreted is, God with us. Then Joseph being raised from sleep did as the angel of the Lord had bidden him, and took unto him his wife: And knew her not till she had brought forth her firstborn son: and he called his name JESUS” (Matthew 1:23-25).
Jesus called Himself “the Son of Man” many times in the Bible.
“And Jesus saith unto him, The foxes have holes, and the birds of the air have nests; but the Son of man hath not where to lay his head” (Matthew 8:20).
“And he began to teach them, that the Son of man must suffer many things, and be rejected of the elders, and of the chief priests, and scribes, and be killed, and after three days rise again” (Mark 8:31).
“The Son of man is come eating and drinking…” (Luke 7:34).
Any man who does not believe and confess that Jesus came and dwelt among His creation clothed in human flesh is an Antichrist.
“For many deceivers are entered into the world, who confess not that Jesus Christ is come in the flesh. This is a deceiver and an Antichrist” (II John 1:7).
“And when the centurion, which stood over against him, saw that he so cried out, and gave up the ghost, he said, Truly this man was the Son of God” (Mark 15:39).
Jesus Christ was both Divine and human. He was the Word of God that created all things. And the Word was made flesh when He came to this earth, born from the womb of the Virgin Mary. He lived a perfect life and fulfilled all of God’s Law. Then He willingly laid down His life on Calvary’s cross, paying the price for the sins of mankind. His Body went to the grave, His Soul went to Hell, and His Spirit went into the hands of the Father. After three days, the Father raised Jesus Christ from death, hell and the grave. Today He sits at the right hand of God making intercession for mankind.
Whilst Jesus walked His earthly journey, having been made in the likeness of men and being fashioned as a man, He was tempted in all points as we yet without sin. Jesus never allowed the cloak of His humanity to dominate the Eternal Deity of the Christ living within His human vessel. He always kept His humanity under subjection to the will of His Father.
“But made himself of no reputation, and took upon him the form of a servant, and was made in the likeness of men: And being found in fashion as a man, he humbled himself, and became obedient unto death, even the death of the cross” (Philippians 2:7-8).
“For we have not an high priest which cannot be touched with the feeling of our infirmities; but was in all points tempted like as we are, yet without sin” (Hebrews 4:15).
Yes, Jesus Christ was both: Son of God and Son of man.