Want to know who and what The Bible is all about? The Bible from cover to cover, front to back is about Christ Jesus and the demonstration of how much He loves us.
Throughout the Old Testament this observation can be drawn - a relationship is broken, a temporary fix is applied, and a prophetic solution is mentioned. The Old Testament has many stories that teach us life and historical lessons. It also contains a plethora of requirements for relationship restoration between us and God. This Law over our relationship with God was set up to show us that we could never fulfill it. The Law could never be met except by God Himself in the flesh and the Old Testament foreshadows of the time when Christ Jesus would come and do just that.
At the end of the Old Testament we arrive at the beginning of the New Testament, known as The Gospels - Matthew, Mark, Luke and John. The Word of God in flesh arrives on the world scene and these books tell Christ's main stories, His words and most importantly His mission. "Jesus did many other things as well. If every one of them were written down, I suppose that even the whole world would not have room for the books that would be written." (John 21:25) Christ Jesus redeemed and restored humanity's relationship with Father God by His sacrificial death and His victorious resurrection. His life was lived perfectly so that The Law was satisfied in Him. Therefore, His death and resurrection fulfilled what we could never accomplish and ushered in an eternal relationship based on His Saving Grace or said another way His - Saving, Unconditional, Loving Favor.
The rest of the New Testament is mainly composed of Paul's letters to many regional churches. Christ Jesus has ascended to sit at Father God's right hand, meanwhile He sends the Holy Spirit to dwell within the Christian to lead us daily in our walk with Him. Paul helps out by instructing us about better Christian living throughout his letters or books between The Gospels and ending books of The Bible.
However, also contained within these books and John's end book - Revelation - is the promise of Christ's return to gather His bride the Church and take her home to Heaven. Again, it is all about the care Jesus shows with us by His Spirit and Jesus coming for us in the End Days.
We betrayed God's relationship in the beginning and yet God's own Word in flesh, His Only Son was the prophesied price to a humanly, unattainable, relationship requirement system established by God. He lived perfectly and died once and for all so that a new way of The Spirit could be brought to us. That is how far we fell - that it took Christ, Fully God and Fully Man (Hebrews 2:10-18) to make a mends for us, but He did and His Plan was to show us this Love, His Love all along - it says so in The Book.