There may be fairies at the bottom of the garden. There is no evidence for it, but you can't prove that there aren't any, so shouldn't we be agnostic with respect to fairies?
“Well I tried to, but I could never write anything that I liked or was worthwhile. I threw it all out and realized that I had to make a serious study- that my tastes were far more advanced than my abilities.”
“Just in terms of allocation of time resources, religion is not very efficient. There's a lot more I could be doing on a Sunday morning.”