I have a difficult time with what you are calling fine tuning. You used the Big Bang as an example. This is something that essentially came from nothing, and created everything their is. Can you for a second imagine the almost infinite possibilities that may have came into existence in that instant? How many alternate possibilities might there have been. So the big bang happens and all the possibilities that may exist mix up. Those that work, survive, and become part of reality. Those that wont work, never come into existence. Now we have a universe of sorts full of whatever the hell the big bang created. All those elements buzzing around bumping into each other. Who knows what was there in those first moments of the universe. But the elements that were able to combine in one way or another did. The elements that did not work, did not. Leaving just the stuff that work. There is no fine tuning here at all. Just stuff that works that survives, and the stuff that does not work that fails. So now jump a few billion years and we have planets, stars, plants animals and all the wonder that makes up our universe. By this time, all the possibilities that arose that failed because they did not fit into the nature of our world have disappeared. All that is left, is the stuff that worked. Now imagine I find an uninhabited island somewhere. So I grab a boat, I grab Lions, Sheep, and bees. I stick them in a boat, and drop them off on the Island. Only on the island their is only masses of tiny flowers. The sheep do OK, because they eat the flowers, The bees do OK because they make honey from the flowers. But the Lions need meat, so, they need to eat the sheep. After a time, the last sheep has been eaten, then, after a time, with no food, the last Lion dies of starvation. 10,000, years later you land on the island in a boat, and are blown away by the amazing harmony that exists between the beautiful plants and flowers, and the masses of gorgeous beehives and bees that populate the island. So you say, "My goodness, how can something so amazing exist. Look at the fine tuning that exists to make this perfectly harmonious Island, and the balance between the bees and the flowers. Something this wonderful could only exist by the fine tuning of god. But the reality is, It was never fine tuning. It was simply that all the things that did not work in the environment, (the sheep and the Lions) disappeared long a go, leaving only the things that could work on the island. This is natural Selection Not Fine tuning. Does that make sense?