Back when I was actively engaged in yahoo answer's religion & spirituality section, I came across the faith argument. Oftentimes debates can end with the theist retreating to "You just have to have faith".
I've had trouble arguing against faith for a while, but then I came up with this retort:
Your 'faith' is merely another word for 'denial'.
Take this passage from the God Delusion, for example: (pg 19, paperback)
"Fundamentalists know what they believe and they know that nothing will change their minds. The quotation from Kurt Wise on page 323 says it all: '...if all the evidence in the universe turns against creationism, I would be the first to admit it, but I would still be a creationist because that is what the Word of God seems to indicate. Here I must stand'."
Another example: "No matter how much your stance makes sense, no matter how much evidence you present, no matter how many contradictions there are in my stance,
my faith keeps me believing."
Now replace 'faith' with 'denial'
"No matter how much your stance makes sense, no matter how much evidence you present, no matter how many contradictions there are in my stance,
my [denial] keeps me believing."
Does anyone have other ways to argue against religious faith? (not faith in the general sense)
"Faith is believing in something without evidence" is not convincing enough, I'm afraid.
Here are the theists' responses: