To understand John 8:44 one first needs to read it in context:
http://www.lds.org/scriptures/nt/john/8?lang=eng
Going along with the weirdness of John, that chapter starts out with
1 Jesus went unto the mount of Olives.
Good for him.
2 And early in the morning he came again into the temple, and all the people came unto him; and he sat down, and taught them.
What did he teach them? Nothing important enough to include in the bible.
3 And the scribes and Pharisees brought unto him a woman taken in adultery; and when they had set her in the midst,
Prodnoses found someone making the beast with two backs. And?
4 They say unto him, Master, this woman was taken in adultery, in the very act.
These loons don't know the meaning of the word privacy. If I was being intimate with a woman, I would be more than put out to find out that an entire villageful of idiots were peering in my window. Anyway, why wasn't the bloke dragged along? are you proposing mysogyny? Or was she simply masturbating?
5 Now Moses in the law commanded us, that such should be stoned: but what sayest thou?
What is she accused of exactly?
6 This they said, tempting him, that they might have to accuse him. But Jesus stooped down, and with his finger awrote on the ground, as though he heard them not.
What did he write? Why is that not important enough to be recorded?
7 So when they continued asking him, he lifted up himself, and said unto them, He that is without sin among you, let him first cast a stone at her.
And he knew they were all masturbating/fornicating. Not exactly a guess or a miracle.
8 And again he stooped down, and wrote on the ground.
Yet once again, what he wrote is not considered worthy of recording. Maybe he was just doodling.
9 And they which heard it, being convicted by their own conscience, went out one by one, beginning at the eldest, even unto the last: and Jesus was left alone, and the woman standing in the midst.
And much as the Patrician of Ankh-Morpork, he simply did nothing until they became embarrassed enough to withdraw.
Scroll forward to verse 44
44 Ye are of your father the devil, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father of it.
That's right, the bible says we are not god's children, but satans. Satan is described as a murderer, except gods murder tally far exceeds satans. Satan lies, except in the garden of eden satan only told truth, and god only told lies.