"Supernatural is a man-made idea which does not exist."
Definition God (http://www.thefreedictionary.com/god)
2. A being of supernatural powers or attributes
So we know God is supernatural, we also know that God(s) are man-made, therefore following from your logic -
God does not exist.
Some quandary there. I wonder if the rest of the religionists are as clear on the matter as you are.
It is interesting how religionists like to focus on quantam physics - which provides some small space for them to get excited (pun intended), but defer from (non-human) biology or geology where they are stuck between a rock and a hard place.
