What's the problem, then? If it's so easy to understand that most humans can do it, it ought to be simple enough for you to explain it to us poor misguided atheists.
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.'