Pastor Jeff Kern's sermon, based on 1 Corinthians 15, centers on the theme of final victory over death and sin. He emphasizes that while death is inevitable and a consequence of sin, true, eternal death only occurs for those who die in sin. The sermon uses anecdotes and biblical passages to illustrate how seeking forgiveness and surrendering to God's power through Christ allows believers to conquer sin's power and achieve victory. Ultimately, the message urges listeners to actively pursue a relationship with God and prepare for the second coming of Jesus.