In the fifteenth episode of "Identity Theft," Duane Sheriff teaches that we are united with Christ in His death, burial, and resurrection as believers. This unity signifies that Christ lives in us, giving us hope and a new life through faith. Colossians 1:27 states that "Christ in us" is the hope of glory, and Galatians 2:20 speaks about being crucified with Christ and living by faith in Him. 

Through baptism, believers are spiritually united with Christ's death and raised to new life, as highlighted in Romans 6 and Ephesians 2. Apostle Paul discusses in Philippians 1 his struggles between living on Earth or departing to be with Christ. Our physical bodies give us authority on Earth to empower us to carry out God's work, spreading the gospel and overcoming sin, the flesh, and Satan. 

Duane shares his revelation of comparing our unity with Christ to the process of making tea. Tea bags are infused with water, making them indistinguishable from the tea. In the same way, believers are so infused with Christ that we are one with Him in spirit. This profound union means we carry Christ within us and are called to live out His life through our actions. Our role as the "bride of Christ" involves a spiritual marriage with Jesus. This union requires loyalty, faithfulness, and a commitment to living a life that honors God's grace and truth.