We're all familiar with the well deserved atheist critique of fundamentalist Christianity. Heck, Catholics even share in it.
But there's a much harder, and more important nut to crack. Fundamentalist Christianity can't withstand the light of the internet- in fact, many of the smaller churches actually forbid their members to go on the internet.
But fundamentalist Islam is the bigger threat, and its theology is even more logically incoherant. And it is on the rise- in a very violent way. So I suggest that perhaps a better use of time would be in disproving Allah, rather than Yahweh. Try the Koran on for size next time you want to criticize a scripture.