A universe with a God would look quite different from a universe without one. A physics, a biology where there is a God is bound to look different. So the most basic claims of religion are scientific. Religion is a scientific theory. – Richard Dawkins
There may be fairies at the bottom of the garden. There is no evidence for it, but you cant prove that there arent any, so shouldnt we be agnostic with respect to fairies? – Richard Dawkins

