[ericsp23]

There is a scientific theory that can account for the creation of matter at the instant of the big bang that do not violate the conservation of matter and energy. The way I understand it, at the instant of the big bang, there was a singularity, and due to some kind of quantum instability, a massive period of hyperinflation ensued, during which time space-time inflated at a massive rate in an instant (we're talking billions and billions of light years per second). The massive expansion created an "energy deficit" which was filled by the creation of matter and energy. In this scenario, matter and energy are actually created to satisfy the conservation of mass and energy. (This is my understanding of the hyperinflation theory, and it is probably over simplfied, if anyone can elaborate further I would be grateful.)
Now the next obvious question is, where did the original singularity come from? We know that singularities are not that uncommon in our own universe (blackholes), and some physicists have suggested that each one of these singularities could potentially spawn its own universe. In this scenario, there would exist a multiverse, where each universe buds off of an older universe.
So you see, there is no reason to assume that there was any kind of intelligence involved in the big bang. There is a perfectly reasonable scinetific theory to describe it. Whatever you choose to believe is your own business, but you have not proven the existence of god or even demonstrated that god is likely to exist.