Guffaw!! Nobody has ever been brain dead enough to imagine Christers weren't narcissistic bigots who imagine they have an absolute right to control what everybody else is allowed to do or say or think. After all they've been loudly asserting this special privilege for more than 2000 years.
I'd be willing to bet millions that 98% of those signatures belonged to dumb@sses who never bothered to read the Pratchet/Gaiman book or view even one episode of the series. Their Christer handlers merely had to say the word and all their slavishly obedient followers tripped over themselves in their hurry to comply.
As they used to say on Vaudeville, "Scr*w you, if you can't take joke!" That said, the wildly popular "Left Behind" series is even more far out theologically, than "Good Omens" and not nearly as funny.
They need to lighten up - it's fiction. but it boggles the mind they're so worried about this but won't insist we do something about climate change - a REAL threat that will kill their grandchildren