Brokeback W,
Your comments: "I think it is important to acknowledge man's spiritual side and not take a extreme materialistic approach to man's psychological condition."
Assuming I would agree that the spiritual side means having empathy, fellow feeling, deep emotions about family, relationships, nature, justice, etc., the problem I have with the above statement is that it isn't either/or. I don't consider myself spiritual in the least, but I consider myself a deeply caring, sensitive individual. I also don't take an extreme (or even a non-extreme) materialistic approach to anything. I am very much a minimalist and a planet sustainable person. Your comment suggests that without what you consider a belief in a deity one becomes a selfish, hedonistic monster. It isn't supported by empirical data, which suggests the opposite.
Mankind evolved to deal with the difficulties of being human; it wasn't pleasant for anyone (well maybe the kings and caesars) for 100,000 years and it isn't pleasant for billions now. Most didn't make it past childhood, and the average age of humans, for 100,000 years, is estimated to have been 34 years. Couple that with an evolved awareness of life, the world around them and a desire simply not to die, and it is easy to see why our ancestors were looking for reasons and answers and subsequently created creators, gods, near-gods, used-to-be-gods and wanna-be-gods. Something had to be better than the difficult lives they were living.
And Oubilette, all apologies regarding the spelling. Darned auto-correct.