I work for a liberal (reformed?) Jewish family and just today I was talking to one of the more distant family members, in his 50s, and he was curious about why we had last Friday off, that is the public holiday for the RCC Good Friday.
I jokingly suggested I give him a book to explain it to him but he took the bait but asked that it was in English! So, what do I give him? Any suggestions?
EDIT: I should mention that based on what he has said in the past, he has very shallow understanding of religions in general. In his few, all religions are pretty much the same....