Even though it seems counter-intuitive, religiosity is statistically on the decline.
Anyone who has ever spoken at length to a theist knows that the most rational and evidence based argument will never get through to them. The difference is Metaphysical and while non-belief is subject to disproof, belief is not. Atheists are small in number not because their arguments are insufficiently believable or there is just too much evidence in favor of god, but because theism offers a great deal of security without any actual cost to the believer in terms of social standing, responsibility,or respectability. In essence this is what faith is all about.
While Christianity is logically impenetrable (from the viewpoint of the believer) too much faith can lead to embarrassment if the society as a whole deems that form of cognitive dissonance undesirable. Historically, the trend has been a slow but steady creep from Theism to Deism.
So here's my question. While Theism can be chipped away at through science and social progress (the Earth was flat, women were inferior, 6000 year old earth, etc) can Deism ever be conquered? During Harris's debate with the Rabbi, I saw him retreat further and further into Deism every time Harris pointed out a logical fallacy or asked for proof. In my mind, something as purely metaphysical as a Deistic faith is totally invulnerable to criticism or change.