Simon is often thought to be either the archetype of a Christ figure or to represent Christ. Whether you look at him as an archetype or symbol, they both perform the function of making the reader realize he was an answer, and a possible hope, but no one would listen to him. Because the people failed to hear his message, in their ignorance, they killed him. We see this Christ figure not only in Simon's death, but also in the way he lived his life. If you go back and reflect on some of Simon's actions recorded, you will see he was always noted as helpful and kind. He never sought a leadership role or attention. The character of Christ on earth was said to have a similar homely attitude. Simon helped build the structures and he offered to go back and watch the little ones when it was getting late.
His trek alone through the jungle (or garden) and his time with the Lord of the Flies (a direct reference to Satan) proves the Christ symbol even further. The bible presents that Christ's 3 day struggle after his death was with Satan, and Christ won. Simon faced the Lord of the Flies and conquered the fear of the boys as he also identified that there was no beast on the island, it was just the man in the parachute.
Simon is a character who is unlike any other characters in this allegorical novel. If Ralph stands for civilisation and Jack represents human savagery, Simon seems to represent some kind of mystical goodness that links humanity with nature. Whereas the other boys, even Ralph and Piggy at points, are quick to abandon morality very soon after ending up on the island with no adults to enforce it, Simon retains his morality and continues to act on his idea of what is good even without adults around to enforce this. He is the first character to realise that the beast actually is within the boys themselves:
What I mean is... maybe it's only us.
Simon therefore represents some kind of messiah-like figure whose essential goodness separates him from the other boys and likewise seems to point towards the real lack characters who are driven by morality alone. His death at the hands of the other boys cements his comparison to Jesus, suggesting that in the real world, as well as on this island, there are few people who are good instinctively rather than as a result of customs, culture and laws. The majority of humans, Golding thus argues, are just as savage as Jack at heart.
He is said to be Christ like and martyred because he is the only one who possesses no evil. He is also like the good samaritan going out of his way to help everyone and trying to make peace amongst everyone.