Can't Believe Nobody Got it Right

I'm watching the game show Jeopardy last night, and the final "question" was the word that describes 1.1 billion people in the world today, and was basically first applied by St. Ignatius of Antioch around the year 100 A.D. Given the fact that this word describes 1.1 billion people, you'd think at least one of the fairly bright contestants on the show last night would have known the correct answer (which must be given in the form of a question). Heck, even I, not the sharpest tool in the shed, knew the answer right off the bat. Well, two of the contestants (one an attorney and the other a college professor) wrongly answered "What is Christian?" and the third contestant answered "What is Chinese?" Needless to say, I suppose it would be fairly safe to presume that none of last night's contestants are the word that describes 1.1 billion people today.