humans are pattern seekers.
to wonder what our world would have been like without the god myth, would be to wonder what it would have been like with no stories or myths at all. we would be completely different animals i'd say.
god is a direct result of how we are wired. to find pattern and explain it, with stories. and God is found in all cultures because we are similar. Jung's Collective Unconscious explains this phenomena well, imo.
i think if we meet other intelliegent life forms, we will be surprised at how differently we think. mammals have a pretty unique chemical history. we may be pretty unique with the God concept too. some other life forms might not even think in terms of symbols. and this is what god is (imho of course!). a symbol for the patterns.
i can't even imagine what our world cosmos would be like.
tetra