The 20th century French composer Olivier Messiaen was a devout Roman Catholic and notably claimed that his music was an expression of his faith. Unsurprisingly, many performers and listeners consider Messiaen's strong religiosity central to their appreciation of the composer's music. Music scholars have devoted much energy to exploring how Messiaen's music was an extension of his religious beliefs. Yet, these works tend to discuss Messiaen's Catholicism...