I agree that Terry's suggestion is unfair -- that because we have trouble conceiving of God, our weak conception somehow makes God lesser. If God exists, he is not dependent on our ability to conceive of him, any more than the laws of physics are dependent on our understanding of them. At one time, humans had a very weak understanding of physics, but those physical laws were just as valid as they are now; at least, I don't see anyone suggesting that they have gotten stronger or more complicated since our descriptions of them have become more confident and precise. Even when scientists believed in a cosmic ether, or in phlogiston, or in spontaneous generation, the real universe kept on ticking regardless.
That's an interesting suggestion, prologos. It has occurred to me in the past that we might exist in God's mind altogether, as a sort of thought experiment. One way or another, it could be that our existence is totally dependent on him, moment to moment. Certainly your idea would explain how God can know all things, although it's also hard for me to grasp the concept of God being time just as it's hard to grasp the idea of His having no beginning.
At the same time, as someone who works with computers, it's hard to shake the idea that we might be in a giant simulation, run by more advanced beings. They might be no more like God than a person who sits down to play The Sims on his PC and watches sim-people go about their sim-lives and satisfy their sim-needs until he gets bored and shuts down the computer for the day. The goal of our universe, their experiment, might simply be to see what happens, just for fun. In fact, a game of Civilization might be more accurate than a game of Sims.
To take things back to Terry's point, his initial assertion that the idea of God does not make sense simply lacks weight with me because there are aspects of science that make just as little sense. Why should a hazy collection of interstellar gas give rise to a rocky planet with water, where organic compounds form into cells? That's absurd! Perhaps true, but still absurdly hard to imagine! Why should these early cells have a desire to replicate and survive? They were just bags of water and long strings of atoms forming carbon-based compounds! How silly! How is it that light behaves as a wave without a medium to travel through, and that quanta, building blocks of matter, have indefinite states until observed?
Why, if I wanted to mock scientific theories based on current gaps in their explanations, or on their seeming far-fetched, we'd be here all day! But Schrödinger attempted to do that with his rhetorical cat, and look where that got him. If we are really closer to the truth today than we were before quantum theory, then Einstein, Schrödinger and others have egg on their faces! If such smart people can be wrong in doubting in concepts that they had trouble understanding, what does that mean for you, Terry? :)