Cause and effect law. There is no way for a effect being bigger than the cause, so how the big bang could happened, and the world since this has being more and more complex? It seems to be a science contradition.
What about the biogenesis theory, that say LIFE creates LIFE, people who believes in the Big Bang theory just forgot to say who pressed the Button, and ignores the fact that something without life couldn't create this world....hehe
God is the perfect creator, He is the Cause and we are not more complex than him. Also, he is the LIFE that gave us LIFE.