Stop It, You're Giving Us a Bad Name:
The normal shorthand way that Americans proclaim that they adhere to a standardized moral code regarding their treatment of other people is to acknowlege membership in a religion. If you don't have such a membership, sensible people will rightly wonder whether you have ANY moral code. Until you convice them that you do, folks have a right to be a little leery of dealing with you.
In my America, the normal shorthand way we proclaim we adhere to a standardized moral code is to call ourselves law-abiding taxpayers.
The author is himself an atheist, proudly in the closet. (He calls anyone out of the closet an "asshole".) It really is true: sometimes an atheist is someone with just one fewer stupid idea than a theist.