Simon, depicts spirituality and man's innate goodness. As more of a spiritual creature than the other boys, it is only he that discerns the evil innate in man.
Like Christ, Simon is depicted as compassionate, altruistic, and peace-loving. In Chapter Three Simon provides fruit for the boys in a manner much as Christ provided bread in one of the gospels:
Then, amid the roar of bees in the afternoon sunlight, Simon found for the fruit they could not reach... passed them back down to the endless, outstretched hands.
Then, specifically, in Chapter Eight Simon--whose name is Biblical--retreats to his glade in the forest where he confronts the pig's head, called the Lord of the Flies, which is the name for Beezlebub. In poetic prose reserved for Simon, Golding describes his conversation with this symbolic devil:
Fancy thinking the Beast was something you could hunt and kill!...You knew, didn't you? I'm part of you? I'm part of you? Close, close, I'm the reason why it's no go? Why things are what they are?"
With his intuitive and spiritual powers, it is only Simon who understands the beast. Still, he must confront the Lord of the Flies by looking directly into its face, just as Christ spoke with the Devil in Matthew 4: 1-11 when He was led into the wilderness.
Further, Simon is Christ-like as he becomes the sacrificial victim when he returns to the boys and tries to tell them that the evil lies within them, and he is savagely killed by his own kind, just as Jesus was.