“In principle Genesis 3 contains the entire history of humankind, all the ways of God for the salvation of the lost and the victory over sin. In substance the whole gospel, the entire covenant of grace, is present here. All that follows is the development of what has been germinally planted here.” (Herman Bavinck, Reformed Dogmatics, Vol.3, p.200)
What an wonderful affirmation of the divine inspiration & unity of Scripture. If the Bible were a merely human book, it could never hope to achieve such a single-minded unity of purpose & message. Genesis 3 contains the seed planted that grows & expands throughout the Old Testament until the gospel of Christ is fully revealed in all its glory in the New Testament.
From the opening chapters of Genesis all the way to the final chapters of the book of Revelation, we have one Bible, one message, and one Savior at the center of it all – the Lord Jesus Christ!
Genesis 3 is the whole story of the Bible in a nutshell!
Schreiberspace 
Reading this I was reminded of a book I received for Christmas – J.V. Fesko’s “Last Things First – Unlocking Genesis 1-3 with the Christ of Eschatology”. In the preface he writes about his experience preparing a Sunday school series on Gen. 1-3, and having to continually turn back and forth between that, and Revelation, to understand “the Last Adam”, and the “Christ of Eschatology.”