What would you say to a person who said that about a book that advocated the mutilation and torture of homosexuals? Just buy it because it offends certain people. Would you?
Bet not. Just a bigot against Christians. That's ok. WE won't lop your head off like Muslums or send you death threats like homosexual radicals.
Enjoy the read. Make him famous. Maybe the next one WILL be about homosexuals.