Hmmm, it might. He and I seem to always be headed in different directions. Of course it might just be that his bike is British, and they drive on the wrong side of the road...
So, if there are things He cannot do, then He is not omnipotent. If He is not omnipotent, then He defies the definition of "God." So why worship Him?
If He is omnipotent then He can, by choice, be evil. I believe there are specific examples in the Bible where God exhibited evil behavior. By "evil," I mean deliberately deceiving or exacting punishment or murder on those who either didn't know any better or didn't deserve it. If He can and does act evil, then why worship Him? Out of fear?