Fundamentalists and nuns live longer. I've read that in a number of psychology textbooks and reputable magazines.
I'll hunt down a reference that you should be able to find in a decent sized library (or on the internet) and post it here.
I was trying to present a possible objection (and make my discussion a little more balanced). The gist of the argument was that even though religion has caused many wars, the psychological construct of a godlike figure can be positive.
Anyhow, my second paragraph deserved questioning the most, as I tried to be brief rather than present a detailed discussion of the matter.
My point was that I believe that the psychological concept of God is (while not exactly "necessary") very useful. I had four hours sleep last night (bet you can tell) and am almost an athiest so I don't feel like discussing a theological matter in detail. I only posted in order to give a different perspective.