If you are responsible for the laws of the universe, you have free will. However, if everything is definable by the laws of nature, any being within it cannot be said to have free will. Although I'm a determinist I don't think that is an especially important consideration for our everyday lives: society just has to make allowances for the level of control each individual has over their own actions.

I consider the belief in something supernatural - something greater than nature - to be absurd. Such a position necessarily means you believe in something greater than the whole, which I find rather illogical and unprovable. If you hold that "god = nature", that is something I can actually comprehend, although I would find it as absurd as saying "supernature = nature".