If you discovered that God didn't exist and realized this, would you commit suicide? No. I believe in no such deities but I'm not suicidal. Tell your theory to the 15% of the world who are nonreligious and (most of them) happy. I'd wager probably happier (on a deeper level) than those who still cling to falsehoods and fairy tales (not to belittle whatever religion you adhere to )
Is it not possible that such stories were written because of the devastation and historical significance caused by floods in general? There didn't have to be a worldwide flood for a large-scale flood to sink a large region and cause a catastrophe for those tribes that lived in that region (for them, that region WAS the whole world).
It's not likely that there was a global flood, it's just not really feasible.
But let's have the benefit of the doubt and say a global flood is indeed possible, and happened. Then of course people would write about it happening. I still don't see how it proves or disproves or has much connection at all to a god?
That we do. Electrochemistry. The brain is an amazing amazing thing I've been struggling to understand it for years. It's not easy and you can't just sum it up with some easy answers and a swipe of the hand, passing off anything mysterious as divine/godly, thereby removing the true mystery... and thus the drive for more knowledge and discovery about our universe.
Sometimes you have to accept what we know, what we don't know, and what is more in the realm of theoretical/philosophy of the mind. I could talk for a long time about feelings, the brain's neurochemistry, the arisal of consciousness from the material brain. There are a lot of people smarter than me on Brainden and they can talk about it too. The brain is crazy awesome... free will (the illusion of?), whether consciousness is the product or passive byproduct, etc... there are a lot of interesting things to talk about.
But as far as the survival thing goes, we are what we are biologically because of the evolutionary process. Our emotions are based in reality, mating, surviving...