Awww, poor dude. Better that you didn't tell him or he might ride his bike into an old folks' home with some firecrackers tied to the handlebars, or blow up a telephone booth or something.
What a lot of people do not understand is their reverence for the colour green - they live in parched lands and the colour green is of lush vegetation. There are actually a cadre of yoyos here who think that any green book is a Koran, completely dismissing green cover Arabic language Bibles such as this one from Amazon.com:
and Biblesource.com sells a Hebrew language Bible with a green cover and so on.
By the way, did you take the pig's head option on your purchase? :)