In the sermon titled "A Rebel with a Cause," Pastor Todd Doxzon explores the life and message of John the Baptist, emphasizing his role as the forerunner of Christ. John is portrayed as a revolutionary, comfortable in his own skin, and unafraid to go against societal norms. The main message of John the Baptist is repentance and turning to God, with a focus on changing one's mind and behavior. The sermon also touches on the themes of baptism and burning, highlighting the importance of aligning one's actions with their faith and finding identity in God's love.