Why is relying on Christ important for Christians?

The reliance on Christ is crucial for Christians, as it signifies dependence on His completed work for salvation. The sermon highlights that while Cain built a city based on his pride, God's people find refuge in Christ, who is both the foundation and the fulfillment of God's promises. Christians are not wandering aimlessly like Cain; instead, they are led by Christ, the good shepherd, who guides them to safety and nourishment. This reliance assures believers that they are justified and secure, not through their own efforts, but through Christ's righteousness and sacrifice, which is sufficient to satisfy God's justice.