What is the main significance of the Gospels?

The significance was to spread who the Christ is and to make known to all generations the correct way to love God. Many practices of the Old Testament were very superficial and Christ is correcting our way to have a relationship with Him, His Father, and The Holy Spirit. It is also to tell the history of mankind's salvation through the Son of God.

The main significance of the gospel is that it makes mortal men and women into immortal personalities.