Have you ever seen the Powers of Ten video? It's a bit dated at this point (since we can see billions of lightyears out as well as interact with individual quarks and even bits of matter that pop in and out of existence all of the time), but is still accurate for where it goes.
I've heard it said that at the sizes of things we're dealing with, a god being able to care about us would be similar to us being able to care about a single atom in our body.( Powers of Ten )
Also, if you think these are neat and haven't looked at my other blog Glimpsing the Future
recently, there's been some good stuff over there I've been linking to (although it's more about robotics, biology, medicine, augmented reality, and where I see technology taking us than size of the universe type things)