the entire concept of godhead, by which I mean a sense of the spiritual extended to infinite transdimensionality, or something of that order

I have no problem with such a concept. I would, however, not call it god. Not because it isn't or can't be, but because most people, especially religious folks, have a much more concrete definition. Also, as soon as you define god in such broad terms in a discussion about atheism, you've lost anything that anyone else can hang their hat on for the purposes of having the discussion. You might as well say that god is the universe, whenever the universe is considered in a conscious manner. Sort of like calling any and all acoustic music "folk". How's that for comparing one undefinable Mudcat concept to another?