The Bible is made up of 66 books and connecting those books together and seeing how the tell one story is an extremely helpful tool when it comes to studying the Bible. Justin Tayler provides Graeme Goldsworthy's summaries on the main divisions in the Bible here.
Too many times, we think of the gospel as a story that jumps from the Garden of Eden (we’ve all sinned) right to the cross (but Jesus fixes everything). On its own, that works fine in communicating the systematic points of our need for salvation and God’s provision in Christ, but from a biblical theological perspective, it doesn’t do justice to what’s actually in the text. Once a person becomes a Christian and cracks the Bible, they’re going to wonder what the big deal is about Israel and the covenant, since that storyline takes up roughly 75% of the Bible. Getting people into that story is important. As D.A. Carson says, the announcement is incoherent without it.
Every story has a main character. The Bible does too. It’s God. Specifically, it’s God as He reveals Himself to us in the Person of Jesus Christ.
Here’s what happens if we learn individual Bible stories and never connect them to the big Story. We put ourselves in the scene as if we are the main character. We take the moral examples of the Old and New Testament as if they were there to help us along in the life we’ve chosen for ourselves.
But the more we read the Bible, the more we see that God is the main character, not us. We are not the heroes learning to overcome all obstacles, persist in our faith, and call down fire from heaven. We’re the ones who need rescue, who need a Savior who will deliver us from Satan, sin, and death. It’s only in bowing before the real Hero of the story that we are in the right posture to take our place in the unfolding drama. Bearing in mind the big story of Scripture helps us keep our focus on Jesus, and off ourselves.