Or at least wasn't always. Perhaps God was once a being such as you and I who evolved into a god. A being without mental blocks to limit his comprehension. A point when we can no longer grasp what it is they are thinking of. Maybe God is the end result of a further evolutionary breakthrough.
Science is in a sense what the entirerty of existance is.
To as maybe even an experiment, the result would be the universe and us. A plant or an animal is only a machine built and run upon a higher level. If you look at it how can God be a god without being a scientist first and foremost. Magic is science that we don't understand. But maybe not.