I wasn't saying that the Harry Potter characters don't risk their lives for each other, I've not read the books, but in many books friends do risk their lives for each other. A book wouldn't be good without at least one good friend dying.
Wait, that sounded really morbid..............
The only thing that I've disagreed with in this whole thread (So many people have a lot of good points) is what
lindil said about lying. Abraham did lie, he was human. All of us have a sin nature and lie, and Abraham was no exception. God however, does not lie. Lying is a sin, and God cannot be around sin, therefor He cannot, will not lie. He doesn't have a sin nature. With Abraham and Issac, God was telling Abraham to sacrifice his son because He was testing Abraham. He did not tell Abraham anything other than telling him to obey him. Abraham knew that God had a plan for him, and Issac. He knew that God's glory would be shown to him, even if He did not understand it at the time. God provided for them, as He always does, by sending the sacrificial Ram, and stopping Abraham from killing his son.
Temptation is a big factor, of which I've noticed in Lord of the rings. Temptation is a part of life, and struggles, like the temptations Frodo and Sam face.
Sorry, that was a "little" off topic, but I had to throw that in.