al·le·go·ry

  1.
1. The representation of abstract ideas or principles by characters, figures, or events in narrative, dramatic, or pictorial form.
2. A story, picture, or play employing such representation. John Bunyan's Pilgrim's Progress and Herman Melville's Moby Dick are allegories.
  2. A symbolic representation: The blindfolded figure with scales is an allegory of justice.

I'm coming clean, here: people sometimes listen to me but instead of actually comprehending they accuse me of lying and/or twist my words. More blunt facts:

1) The Harry Potter books are not entirely an allegory in the way that the Lion, the Witch, and the Wardrobe is for instance. In LWW Aslan not only represents Jesus, he is Jesus, and as such he lays down his life for the sins of Edmund in order to defeat the White Witch (who represents Satan).

2) However, certain aspects of the books can be construed as allegory. A very strong instance of this are the events outlined in chapter one of the Sorcerer's Stone but not explained until later on. Lord Voldemort comes to murder Harry. Harry's father perishes because he will not stand aside. And then when Harry's mother perishes her love for her son creates a protection on Harry that makes it impossible for Voldemort to kill Harry. When he casts the killing curse he is almost defeated. Later when he returns he cannot touch Harry because Harry is encompassed in his mother's love and protection. This is like Jesus' love for us as Christians: He freely died for our salvation and once we accept this gift His protection runs through our very veins. Satan cannot touch us. That's powerful stuff!

3) Voldemort uses dark magic, but he's the bad guy. No one wants him to win. He's the manifestation of evil, a symbol for Hitler or even Satan. He's the ultimate evil, the ultimate bad guy. This, too, is a kind of allegory, but his actions do not directly follow the Bible. After all, Satan's every action in today's world is not depicted in those pages, only prophecies of his eventual actions.

4) In the HP world and our own love and goodness will be the ultimate victors. I have full confidence than in book seven evil will be defeated and good will triumph. This is how it is in the real world, too, even when the dark seems more real than the light.