Good non sequitur here!
We DO know about the ability of the human mind to speculate about all SORTS of things.
Some do this and claim they are true...
"Is it possible..."
It is disappointing that you are making an argument that assumes God is not omnipotent. You can find out more about the heresy that you may or may not (trying to be charitable) be advocating at the link below:
http://en.wikipedia.org/wiki/Manichaeism