So, what is big bang anyway?

So, what is big bang anyway?

http://seemyparadigm.webs.com/fundamentalism.htm

The big bang theory, is a theory in cosmology that explains how the universe evolved from it's primitive state up to it's current. It does not explain how the universe was created, or what caused it to exist. It simply explains how the universe behaved after it was created! People often ask, if God created everything, what created God? Well big bang has the same problem, if big bang turned the universe into what it is today, what created the big bang? You see the game can be played at both sides. At least I never propose that believing in God answers this question. That's a strawman argument used by atheists. Some on the other hand do claim that big bang solves the paradox of beginning of existence, while it obviously does not. So big bang does not serve as an alternative for not believing in God. In fact the Qur'an even describes the beginning of the universe, and it's constant expansion in a similar way.