I have to say, the number of happy agnostics/"spiritualistic" people far outweighs the number of happy atheists I know. Evidently the greater population of the people I know find some worth in that kind of thinking. Then again, I know people who have nothing to gain from anything of a "spiritual" sort, and to them I say "good luck, and enjoy life". Personally, my "spirituality" boils down to my metaphysics: I have no personal Gods, no desire to worship/pray, no rituals by which I live my life, or anything of that kind, just a general structure of reality (*realities). I guess you could say that it's a pretty boring religion, compared to Catholicism or some crap.
I don't need a "God" to tell me that eating, sleeping, and fucking are good things for me to be doing. I don't need a "God" to tell me that working towards my degree(s?), getting a job (or three), and starting a family are good ideas. I find it quite useful to look at "God" as nothing more than what others might call "origin" (whatever "that whence existence came" might be called). It doesn't really do anything, so how could it have any impact on my physical life? But to look at it, witness it, experience it, and revel in it, are fantastic things for me to be doing in the spaces between eating, sleeping, and fucking; to me, this existence/experience is so vast and wonderful that I have no other option but to call it "God", and give it its due respect.
How amusing, to think that that omnipotent, all-knowing thing "does" nothing with its knowledge and power, but, if anything at all, merely watches.