I don't think being religious makes people happier - or unhappier. How happy one is has, I am convinced, very little relationship to one's actual life (outside of extreme circumstances, of course). kinda like weight has little relationship to one's personal discipline. It's genetic above everything.

I tend to ugh about the term "spiritual" because it's too new-agey for me, too. I'm about my old-school religion, replete with grimness and blood and reality and a covenant with G-d, ancient traditions and There Is No Other Hand.