Use given code + your guess at its rank (01-15) by # of adherents in US. Ex: BA03 for Baptists at 3d most. Rank must be guessed exactly, with guesses +/-3 or more from right answer ending the game.
Note: I've spiked out the top 9 Christian denominations (marked with an *) to make the quiz more interesting, and the remaining denominations I've included but I'm not having you guess because guessing how many 'others' is really too vague. Data are estimates of adherents for 2004.