I wasn't interpreting Golffly as saying that Faith personally made it up, just that she's promoting the made-up nonsense of fundamentalism. Golffly compares it to all the other religions that do exactly the same thing, believing unequivocally in stuff they've made up. Faith could no more convince a fundamentalist Muslim of her made up nonsense than he could convince her of his, because religious belief doesn't derive from evidence.
--Percy