This is, to say the least, an intriguing project. In August 2005, Derrickson—a self-confessed Christian—sat for an interview with Christianity Today prior to the release of Exorcism of Emily Rose, which he directed. (The film was listed on CT’s Top 10 Redeeming Films of 2005; see CT’s review here.) It is a very interesting Q&A—well worth the read, especially in light of Paradise Lost.
For more info on Paradise Lost, see Christian Classics Ethereal Library, which has the entire text online as well as info about Milton. You can also find the text at Paradise Lost Study Guide, which also includes essays, Q&A and analysis (these are from a secular viewpoint). SparkNotes’ Paradise Lost is a great resource, containing a plot overview, summaries of each section, character list, themes/motifs/symbols, etc.