How do we know that Christ's birth was significant for salvation?

The significance of Christ's birth lies in its role within God's redemptive plan. As the angel proclaimed in Matthew 1:21, Jesus 'shall save His people from their sins.' His birth signifies the fulfillment of prophecies and the coming of God incarnate to effectively save and redeem. Without the birth of Christ, there would be no incarnation, and without the incarnation, there could be no salvation. Thus, His birth is not a mere event but the very foundation of our salvation, making it crucial for every believer's faith and hope in Christ.