Sacrifice for others is a Christian principle. I just fail to see this instance as symbolic of the death of Jesus.
Jesus sacrificial death is meaningless without his victory over death and the blood which cleanses us from our sins. Our being reunited with the Father through his work. What was purchased for Harry? Time? That's not to demean the sacrifice but, they are hardly similar in scope or meaning.
Lily's self-sacrifice is not the ringing sacrifice-relating Christian theme that people look at today; The major Christian theme is shown at the end of the last book, the Deathly Hallows.
I hate to give spoilers, but as you probably won't read the books anyways:
Harry, at the end of the last book, has learned that he was meant to die, so that Voldemort could be killed. Dumbledore, Harry's headmaster, friend, and almost father-figure, had long ago made a plan for Harry's raising and death; he planned out Harry's whole life for him, without Harry knowing it.
This is the time when Harry realized that he should sacrifice himself in order to defeat Voldemort. Quoting from Chapter 34 - The Forest Again:
"Finally, the truth. Lying with his face pressed into the dusty carpet of the office where he had once thought he was learning the secrets of victory, Harry understood at last that he was not supposed to survive." DH, p 691, The Forest Again
Harry's sacrifice actually is comparable to the magnitude of Christ's own; you see, Voldemort is, by this time, practically immortal. He uses the darkest magic to bind himself to the earth by splitting his soul and sealing pieces of himself into objects that he has hidden from the world; as long as these pieces exist and ive on, he cannot die, even if his body is killed. He has ways to easily restore his body. At the same time, he is the most skilled wizard alive, probably the most skilled ever to have walked the face of the earth, the deadliest there ever was. His reign of terror was much like Hitler's; he rounded up muggle-borns and half-bloods and what he thought of as filth, had them killed: His plan was to cleanse the world and fill it with only purebloods, those of purely wizarding origin.
It is hard for one who has not read the books to appreciate the magnitude of Voldemort's reign; put simply, he spread fear, confusion, and distrust by making drastic changes while remaining behind the scenes; he controlled the media, the government, and Hogwarts School. When you add in the aspect of what dark magic can do without government restriction, it is extremely terrible what can go on under his command.
Now, if Harry had not given up himself to kill Voldemort, Voldemort would have continued his reign forever; remember, he was immortal. In this way it represents the continuing death that would have gone on had it not been for Christ's death on the cross. It is very similar.
Harry's sacrifice saved the Wizarding world for thousands of years to come; the only way Voldemort could have been defeated would have been if another, more powerful wizard had come along, which is unlikely in the extreme, and that same wizard still had to find and destroy all of his ties to the earth, in which he prevented himself from being killed. This is an even harder task than actually doing the killing, for the enchantments and spells placed around the Horcruxes would be of extreme difficulty to get through, perhaps impossible; most barriers would require the person to kill themselves, or drive them insane, and the like. It would not have been possible.
Harry's sacrifice for the Wizarding World, and his walk to Voldemort through the Forest, resolving in his head and deciding that he would die for all, is the epitome of Christian themes. And in the end, Harry's decision to die was what saved him, for Dumbledore had planned it to be so.
Anyways.
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