Interesting article, and I might agree with some points, but I tend to think that spirituality is not really much of a thing to live by. He basically defines it as an emotion, a feeling of awe. Emotions are the enemy of reason, are they not?
Besides the desire to think clearly, which I believe is aided by science much more than spirituality, I didn't grasp any other reason that he gave for the benefit of spirituality. It certainly can't answer "why" to anything, as nature itself presents no answers to "why". So looking at trees and birds tells us nothing except that nature is nice. To go beyond that is to use our imagination to make artificial value judgments, and that's what religion does.
If someone wants to make decisions in a clear-thinking way, then they should rely on reason. Leave emotions for the things that aren't life-changing decisions, but which make life enjoyable from day to day, like laughing at a movie, or snuggling with your mate.