I respect your opinion, but disagree on your take of nature tending towards disorder and deterioration. Nature is. It is both life and the regeneration or elimination of it, all on its own. There is no celestial hand or voluminous voice that orchestrates our destiny. The Earth is a living, moving, changing planet, all its own relative to its relationship with the rest of the universe. 

The good and profound aspects of a god concept, lay within us naturally, because we are a part of nature. Not separate from it like so many choose to believe. How could this not be the reason that our natural human inclinations would over time, be inserted into a superstitious belief? I think our most recent history (the last 2 thousand years) proves it. A mere human can tell me he knows the answer, and what my destiny will be, but full observance of nature says otherwise.