The island that the boys land on can be construed as a paradise like Eden. Problems, however, are encountered when trying to find characters to fit the typical roles of Adam, Eve, the snake, and God. Ralph fits Adam's role well enough, and Jack the snake. God can be played by the mysterious Lord of the Flies. This makes sense since Christianity holds that God must be feared. Ironically, the beast is non-existent, so the only thing to really fear is fear itself. But nobody really fits the role of Eve. Piggy does not seem like a smug fit. The original sin is the exemplified by the words of the young boy with the mulberry colored birthmark. He warns everyone of the beast, which he says is a snake-like thing.
Also, the only group that knew each other - the choirboys - have Jack as their leader, who eventually reveals his true evil nature. Another theme highly tied in to religion is the difference between good and evil. Samneric represent the duality of good and evil, as they are twins who cannot be separated.
Lord of the Flies Quotes about Religion
"Balanced on a high peak of need, agonized by indecision, Ralph cried out:
'Oh God, oh God!'" (page 71).