>> mark, john, matthew -- >> no, i don't know them. >> you just went to mass? >> yes. >> you don't know the four gospels? >> no. >> reporter: so, what are the four gospels? matthew, mark, luke, and john. and fewer than half of americans got it right. in fact, out of 32 questions on this pop quiz from the pew forum on religion and public life, americans got, on average, 16 right. do you happen to know the name of the holy book in islam? >> koran. >> right. >> reporter: the highest scorers? atheists and agnostics, who got nearly 21 questions right, on average. as compared to white evangelical protestants, 17.6. hispanic catholics who got an average of 11.6 questions correct. what's the first book in the bible? >> genesis. >> where, according to the bible, was jesus born? >> jerusalem. >> bethlehem. >> oh, yeah. that's embarrassing. >> reporter: church leaders we