For a basic argument: The third(?) law of thermodynamics states that matter is in a constant state of decomposition, order to chaos, etc. An outside energy force is required to go the other way, which there isn't. People I've argued this with try to tell me lightning, or more specifically the passing of positive and negative charges, is an outside force, and that's how we came to be. Lightning didn't create the universe, there's nothing anybody has ever seen or can realistically theorize that would support that 'lightning' was able to form to cosmos.
From all this, and more that I won't bore you with, I beleive that God created everything. My family is something of a medical family (father owns surgical instrument business, brothers in college for medicine) I've become familiar with the utter compexity of the human body. Looking at it, it is the ultimate in complexity. I don't beleive that that kind of order came from a dense spinning mass of subatomic particles.