It is!
![Big grin :D :D](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
But it's even harder to be impotent, but I'm hard, so I'm potent..
The only obvious flaw with Decartes logic, IMO, is that humans aren't capable of having the idea of a perfect creature. A perfect creature would be able to do anything, but we aren't able to comprehend that, just look at this classic example:
If god is allmighty then he should be able to create a rock that is so heavy not even he can lift it. But if there exists a rock he can't lift, then he is not allmighty.
My god, I never should have taken that philosophy course..