The sermon titled "Polar Express" discusses the significance of childlike faith in the Kingdom of God. Grant Gardner, the preacher, uses the movie "Polar Express" as a metaphor to explore the theme. He draws from the book of Mark to highlight Jesus' interactions with children and their qualities of honesty, dependence, and unwavering belief. Grant contrasts this childlike faith with the story of a rich young ruler who prioritizes wealth over following Jesus. He concludes by emphasizing that surrendering to God's kingdom leads to true joy and redemption in Jesus.
