Somewhere around here is a letter signed by Santa and clearly marked "From the desk of S. Claus". There you go, evidence that the letter is the true word of Santa.
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.'