The Exorcist

What does this 1973 film tell us about post Hays-Code Hollywood and the ethics of using child actors in roles such as that of the possessed daughter, Regan? What does it tell us about the interaction between the MPAA and film producers/distributors? What does the film make us consider with regard to the problem of the existence of evil and God? Why would God allow a perfectly malignant demon to exist? What do Fathers Karras and Merrin teach us about duty and self sacrifice? How does the film's setting at Georgetown University illustrate the role of religious belief in a more secular age? How do the characters' reactions to Regan's behavior instantiate these two 'realms'?