Yes-God is a Spirit without flesh and blood and invisible to man. In order to make Himself visible to man and in order to shed innocent blood for our sins, He had to put on flesh.Jesus is not another God or a part of God, but He is the God of the Old Testament robed in flesh. He is the Father; He is Jehovah who came in flesh to bridge the gap between man and God that man's sin had created. He put on flesh as a man puts on a coat.
Jesus is "the image of the invisible God". He is God veiled in flesh (Hebrews 10:20). He came to His own creation and to His own chosen people but they did not recognize Him or receive Him (John 1:10-11). Jesus is like no other man that ever has been or will be. He has two natures; He is fully God and fully man. We can easily understand all of this if we realize that Jesus has a dual nature. He is both Spirit and flesh, God and man, Father and Son. On His human side He is the Son of man; on His divine side He is the Son of God and is the Father dwelling in flesh.
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 (John 10:33). Because He claimed to be God they rejected Him and sought to kill Him (John 5:18; 10:33). They tried to limit God by their own preconceived ideas of how God should act. Furthermore, they did not have a thorough knowledge of the Old Testament Scriptures that proclaim the deity of the Messiah.
When Jesus forgave a palsied man of His sins, the Jews thought He had blasphemed because they knew that only God could forgive sin (Isaiah 43:25). Jesus, knowing their thoughts, healed the man; thereby showing His divine power and proving His deity (Luke 5:20-26). The Jews were right in believing that there was one God, in believing that only God could forgive sin, and in understanding that Jesus claimed to be the one God (the Father and Jehovah). They were wrong only because they refused to believe Jesus' claim.
Jesus stressed how important it is for us to understand who He really is the Jehovah of the Old Testament: "If ye believe not that I am he, ye shall die in your sins" (John 8:24). The word he is in italics in the King James Version, which indicates it is not in the Greek but was added by the translators. So Jesus called Himself the "I AM," the name Jehovah used in Exodus 3:14-15. Jesus was saying, "If you believe not that I AM, you shall die in your sins." It is not mandatory that a person have a thorough comprehension of all questions relating to the Godhead to be saved, but he must believe that there is one God and that Jesus is God.