You statement that Energy can not be created or destroyed "it's as simple as that." is simplistic. You are applying laws that man has created to help explain what he sees in the universe. Other posters have told you that energy is created a;; the time from the very fabric of the universe. Yes it 'disappears' very quickly so the net effect is zero, but if it interacts with mass that is very near it, it has a measurable effect. And even if it disappears, it was still created from nothing.
All of this beside the point, we can only guess what caused the big bang b/c out physics break down at that point. It doesn't mean our physics are a joke, or the big bang is a joke, it just means our theories are incomplete. Come on, we just discovered a few years ago that the universe's expansion is accelerating. We are still taking small steps, we're not running yet.
I've read that the big bang could have been a white hole (which means matter was increasing in this universe (inflation)), maybe it was created in a lab in another universe, who knows. And we don't make new laws to just keep reaffirming the big bang. We make laws to understand what we observe. We observe an expanding universe so we try to understand it. It's not to disprove god or creation. Let's be adult about this.