"Only Islam specifies a limit on the number of wives"

Au contrare (or however you frenchify that'n). Both Titus and Timothy require that any church leadership position be filled by husbands of only one wife. Most churchs I have participated in say that this, at least in principle, indicates a superior spirituality to monogamy -- and it's been that way in protestant theology for at least 300 years.

On the one hand you want us to accept answers that have come about by tradition (flavored by culture and context of time) and others you want us to accept as the correct answer only the interpretation of isolated (out of context?) "scriptures" that you have chosen to highlight for the sake of this quiz.

If, on the other hand, you took the current state of those religions as practiced, your answers would be quite different (f'rinstance, for the past many hundred years Christianity has been the chief proponent of monogamy, while, if we were to believe your assertion, by the answers you gave, we would believe that moslems are the monogamous ones now)