Honorable Mention: "Godspell"
This musical literally changed my life. It forced me to reevaluate my Christianity as a way of life and not just a once-in-awhile hobby. The central message of the show is best illustrated by the very beginning of the first act, when God essentially asks the world, "What are you people doing??" and then Jesus comes to the rescue like Superman (only he's wearing a clown outfit, for some reason). It's not quite as powerful as its fellow '70s predecessor, "Jesus Christ Superstar," but the message is still important: Life is a gift from God that shouldn't be squandered. And I got all that from a Jesus wearing a giant, red clown nose.