There are no shades of grey here, either God exists or does not exist. If you believe that something can be created out of nothing then you should believe that God does not exist. However if you believe that everything must have a creator then you should believe that God does exist. The notion of God is many many levels beyond our understanding. It is possible the creator of the Universe itselfis not the eventual God himself. However the argument is simple and there are no shades of Grey.