I'm sure we have letters and other papers he wrote too, plus artefacts depicting him, such as coins for example. A Jesus signature on a sales docket or something would at least be impressive.
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.'