Excuse me, I misspoke. Anything was intended to signify that it transcended any one issue, and that a need for proof was necessary for everything. All the things mentioned in your quote are easily proven to exist (not the stuff about books and christmas presents of course), minus whatever silly epistemological argument someone may wish to make. Thus, they start out not existing, then they are proven through observation or explanation (with the latter's evidence being thoroughly made available).Meaning what? Atheists literally don't believe in anything???