The death of Jesus on the cross on behalf and in place of sinful humankind has been the centerpiece of Christianity for two thousand years. Of course, without the resurrection, the cross would be a waste, but without the cross, there would be no resurrection. Jesus had to die before he could come back to life. Even more, to get to the reason for the cross, Jesus had to die so that we might live.
This view that Jesus died so we don't have to is called "substitutionary atonement," and it's best expressed in Scripture in Isaiah 53:4-6. Substitutionary atonement troubles some believers, in particular young adults who are troubled by "religiously motivated violence." On a personal level, they struggle with a God who would subject his own son to the violence and horror of the cross, something Tony Jones refers to as "divine child abuse."