Guest, let me ask you a question?
what makes a round square? It's your finite mind. You see, you make a square a square in your mind, then have an idea of what a round square might look like and suggest God can't create it? But.. shapes are God's creation, the names of those shapes are man's imagination. Who is to say that a square is not a round square in God's eyes?
See, we could spend all day on this and get no where... God is omnipotent, because He is all powerful. He created everything out of nothing.. man creates out of something pre-existing. In order for you to create a round square, your mind needed a round and a square. God required nothing when He created.
Don't limit the infinite God, with your finite understanding.. to do that makes God finite and so therefore not God at all.