It is a play, developed by the same guys that did the cartoon South Park. It is very blunt, non-politically correct, and it just takes shot after shot at Mormon beliefs and religious beliefs in general if you think about it. It is a famous Broadway play in the United States. I don't know where it travels to, but if you look it up and find that it is near you, it is worth the price of admission. Be forewarned, it has similar humor in it to the South Park cartoon, but it is intelligent. There are lessons too, about kindness and such. It's not all irreverent.
Edit to add: It looks like you can go on youtube and find both acts one and two recorded from various plays. You can listen to the songs as well. Might be worth viewing, though nothing like seeing it in person.