Ask him why his bible says at Revelations 5:9-10 that they will rule as kings on the earth, when in the original Greek it says they will reign as priests on the earth? No actual Greek scriptures says that any Christians will be kings not one in any book?
Tell him that the oldest bible in Greek ever found the codex sicanicus doesn't have jesus assending to heaven in the book of Mark, thought to be the first gospel. This bible also has two more books in the New Testament. So ask why wants up with that and why was it that man was able to change the Bible so much if it was from god?