The significance of the death of Christ is the center of the Biblical message and thus the heart of the Christian faith. When Paul describes the content of the Gospel, that is, the “good news” about Jesus Christ, in 1 Corinthians 15:3-4 he describes (1) the death of Christ and (2) states that this death was “according to the Scriptures.”
In this statement, Paul presupposes (1) that the historical events surrounding Christ’s death, burial, and resurrection are significant, and (2) that the Old Testament will bear out his claim that this is indeed good news. In that same passage, Paul states unequivocally that Christ died “for our sins” (using hyper with the genitive, which signifies agency or representation, more on that in a later post). The death of Christ then served a substitutionary and salvific purpose.
 David R. Dilling, “The Atonement and Human Sacrifice” Grace Journal Volume 5:1 (Winona, IN: Grace Seminary, 1964), 28-29.