Mmmmm. Perhaps I should clarify - I'm not at all sure that changing one's understanding of God's nature is necessary, but it is difficult to avoid changing our understanding of the nature of God's interaction with the physical world. Perhaps the story of Genesis is intended to fulfill different functions at different times. Everyone seeks answers about where they came from, and why they're here, and so Genesis provides comfort to a comparatively simple people with a story of their beginnings in terms that they can understand. But then, as we gradually spread our own wings and begin to explore the wondrousness of the universe, we still see Genesis as valuable for its deeper meaning, illustrating as it does the nature of good and evil, and of God's love for his people. The story doesn't change in the interim, and God doesn't change, but our understanding of its significance changes as our understanding of the nature of God's universe changes. I don't think it's beyond the pale to suggest that God is perfectly capable of tailoring His message to His audience - Genesis provides a simple and understandable tale to a simple people, and a deeper meaning to sophisticated, worldly people like us.