Design can never be an ultimate explanation for anything. It can only be a proximate explanation. A plane or a car is explained by a designer but thats because the designer himself, the engineer, is explained by natural selection. – 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