What does the author mean when he writes With a smile of Christian charity in Casey at Bat poem?

The reference to "a smile of Christian charity" in the poem "Casey at the Bat" highlights Casey's hypocrisy and lack of genuine sportsmanship. Casey, the seemingly confident and accomplished batter, appears to display a friendly and benevolent demeanor, but this facade conceals his true nature. The phrase suggests that Casey's outward appearance is misleading and that he uses Christianity as a veneer to mask his competitive and ruthless desires on the baseball field.