It has been said that if there were one true god performing miracles such as curing the incurable, we should expect to see a religion centred around that god growing exponentially at the expense of all other religions. That we don't see that is pretty decent evidence of the non-existence of such a god, at least.
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.'