"Christianity persecuted, tortured, and burned. Like a hound it tracked the very scent of heresy. It kindled wars, and nursed furious hatreds and ambitions. It sanctified, quite like Mohammedanism, extermination and tyranny."
He always expressed a profound contempt for the Roman Catholic Church, which returned the affection by putting all D’Annunzio’s work on the Index of Prohibited Books.