This is America, where every phenomenon needs an interpretation. There are many proffered for Twilight, the young-adult novels and movies made from them, coinciding with the release of its movie sequel, New Moon.
Are the "Twi-Hards" a cult with teenage adherents who fixated on Robert Pattinson and Taylor Lautner in the way previous generations of 'tweens were on the Beatles, David Cassidy and Michael Jackson, -- because they are fantasy pinups upon whom girls can project their sexual lust in a safe way?
Is "Twilight-ism" it a metaphor of unrequited love, as this essay from Esquire suggests, stating that, "Vampire fiction for young women is the equivalent of lesbian porn for men: Both create an atmosphere of sexual abandon that is nonthreatening"?
Might "Twilight" be the gospel of "predatory sprituality," as this observer hypothesizes?
As Meyer , who is Mormon, sees it, the books are about the erotics of chastity.
As I see it from a home where there's a 13-year-old-girl, it Twi-Hards curious about romance are grateful that Stephenie Meyer's books give them a radiantly ordinary heroine who is a lust object for a Goth (Vampire Boy Edward, played by Robert Pattinson) and a jock (Teen Werewolf Jacob, played by Taylor Lautner), enabling the Twi-Hards to fantasize which type appeals to them more.
As to other religious components of the phenom, here's Rabbi David Wolpe's hilarious delightful "Five Reasons Vampires are Not Jews."