I know you claim it, but it's an unacceptable argument. How could man create anything in a world created by an omniscient, omnipotent god? If you can foresee what your creation will do, and have the power to make that be whatever you want it to be, then what it does is your creation as well.The Bible specifically states that MAN brought sin and death in to the world. Not God but man. You know this!
If man can create entire categories of moral behavior, then I am free to speculate that it was your god that created the evil and sin in man and the universe, and that it was man created the good, introduced it into the world, and that your god stole the credit from man. It's just as possible as the other way around.