Simon is often seen as a Christlike character in this novel. He is kind and gentle and does not become involved in the violence which consumes the other boys. He tends to the needs of the youngest children, much like a shepherd tending to his sheep. Although he is an innocent boy, he is eventually required to offer his body as a sacrifice to the group of boys who seek a violent death for him.
This scene, therefore, is often interpreted as an allegory for Christ's temptation in the desert. In Matthew 4, the devil leads Christ into the desert after he has fasted for forty days and forty nights. He tells Christ to turn rocks into bread if he is indeed the son of God. Christ refuses. The devil then offers Christ all the kingdoms of the world if he worships him instead of God.
The Lord of the Flies tells Simon that there "isn't anyone to help [him]." The Lord of the Flies conveys that he represents evil itself, telling Simon that he should be afraid of his presence and questioning why he thought the Beast was something he could "hunt and kill." Instead, the Lord of the Flies asserts that he is a part of all of the boys and is the reason that "things are what they are" on this island. He is seemingly able to read Simon's mind and tells him that if he tries to return to the group, he will "only meet [The Lord of the Flies] down there."
Simon himself suffers from dehydration at this point—his mouth is dry, and his is tongue swollen. He loses consciousness at the end of this "conversation." Indeed, when he does return to the group, he faces evil itself and is murdered by the group of boys for sins he never committed.