The Gospel of Jesus Christ started with his birth. He was born from a virgin.  And everyone should know we get out blood from our Father. Therefore Jesus Christ had the blood of God in his body.  He came to tell us the truth, and to teach us the will of God. Which is to seek God and his righteousness .  The result will bring you into the new covenant which is the will of God for you life 

The Gospel of Jesus Christ is that we can live life with God here on Earth. He came to fulfill the will of God so that the current covenant would be started .