Well here is the quote I used the other day on the Xianity thread that got all their knickers in a knot.
"If all the achievements of scientists were wiped out tomorrow, there would be no doctors but witch doctors, no transport faster than horses, no computers, no printed books, no agriculture beyond subsistence peasant farming. If all the achievements of theologians were wiped out tomorrow, would anyone notice the smallest difference?"
-Richard Dawkins, The Emptiness of Theology