Challenge accepted.
One must remember that the first twenty-two chapters of Genesis are myth. We are modern human beings. We have scientific means to explain most things. The people who were present 3300 years ago, about the time Torah was compiled, hadn't the faintest conception of the scientific method. This does not insinuate that they were stupid by any means when considering the document they compiled.
As a pre-modern society, their first concern was to ensure solidarity among their people. When considering Émile Durkheim's theory of mechanical solidarity, one need look no farther than the Israelites for a prime example. There are generally two punishments for deviance: death or exile. With those punishments for various crimes, people were kept in line. There are 613 commandments in Torah. 365 negative: "do not" and 248 positive: "do". One's associations in premodern societies were not chosen. The purpose of Torah in the first place can be easily understood as a code of conduct: Torah means "To teach". What is it teaching? Law.
God reveals himself to Abraham. Like the bases for Christianity and Islam, it was a personal revelation. God just spoke to one dude. Maybe the dude was crazy. Abraham, Muhammad, Jesus, and the prophets during the time of prophecy could have easily been dismissed as crackpots.
Let us take the claim of revelation at Sinai. Supposedly, God revealed God's self to several hundred thousand people at the same time. If famine were to say that "the voice of Isaac Newton called to me the evening of the 23rd of October, 2011 and told me to drop a sperm whale and a potted plant off of the Royal Albert Hall", one could quite easily dismiss him as a loon.
However. Imagine that the voice of Isaac Newton spoke to famine and every last GTPlanet user at the same time. Though it is an even more preposterous claim, it is fundamentally hard to dismiss. Could every last GTP'er be wrong?
I'll pick on Christianity as an example of the fundamental contradictions within organized religions.
The entirety of the New Testament, and therefore Christianity as a result, is based on mistranslation and the contradiction of Tanakh.
The whole point of Christianity is the coming of the mashiach which was foreseen during the time of the prophets. However there is no logical reasoning whatsoever supporting the claim by Jesus of Nazareth to the messiahship.
Example: Isaiah 7:4. The word "Alma", which is in the original verse, means maiden, whereas the word "bethulah" means virgin. The word bethulah is not used. Nobody ever said that the messiah would be born from a virgin.
Consider lineage. The Messiah is supposed to be derived from the stock of David, right? One must remember that Jewish lineage was still on a patrilineal basis at this time. Only through one's father was one considered a Jew. Joseph (the father) was a gentile. Not Jewish. In the age of patrilineal descent, Jesus was neither Jewish nor a legitimate descendant of David.
Let us also consider that God explicitly forbids human sacrifice. "You shall not sacrifice your children to moloch".
Well, the New Testament claims that Jesus was the son of God. The son of God was apparently sacrificed on a cross in order to pay for the sins of humanity. The notion that God would engage in human sacrifice is preposterous.