Could it be that what we call the spirit (or soul, or mind or whatever) is merely the brain's way of experiencing what it feels like to be a brain? After all, we can examine the brain's structure physically and measure its functions electronically, but only the organ's owner truly knows what it feels like from the inside.
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'