Why is Christ important in the gospel?

The genuine gospel places Christ at its heart. As Paul writes in 1 Corinthians 1:23-25, we preach Christ crucified because He embodies the power and wisdom of God. Without Christ's death and resurrection, there is no gospel; He died for our sins and was raised for our justification. His role as our substitute is critical—His sacrifice satisfied God's justice, and His resurrection assures us of eternal life. The essence of the gospel is that salvation cannot exist apart from Christ; it is entirely dependent on Him alone.