Why is preaching the gospel important for salvation?

According to 1 Corinthians 1:21, God has ordained that the gospel be preached to save those who believe. The method of preaching ensures that no one can claim credit for their salvation; it firmly places the emphasis on Christ and His work. As seen with the shepherds in Luke 2, the message of Christ's birth was proclaimed by angels, thereby illustrating how the gospel message brings enlightenment and calls sinners to faith. This preaching fosters a heart change, enabling individuals to recognize their need for salvation and to respond faithfully to the grace offered through Christ.