I personally believe that God did create the universe, but he would have done so before calenders, especially accurate ones, so the idea that he created Earth in 7 days is a human, and possibly (read: probably) flawed, idea. Also, I believe God created life so that it would evolve, as it would think and have free will; I like to relate it to how we have self-updating computers. If something were to happen or a better version would come along for that type of creature, it would simply "install" itself so that God wouldn't have to bother with all it.