I think Mr Mather spelled the name of the 'Invisible All-seeing, All-knowing Tooth Fairy in the Sky' with a capital 'G' because he was quoting a book title - which begins with a capital 'G'.

I suspect that we offer the Great Tooth Fairy believers a certain modicum of respect because if we don't we could:

(a) Motivate them to be even more fanatical by activating their 'martyrdom' complexes.

(b) Fall foul of anti-discrimination laws.

(c) Goad them into the sort of murderous rages which their kind have indulged in throughout recorded history and, of course, are still indulging in, in many parts of the world today.

I'm sort of inclined to take those risks, though!