Stop any Christian on the street and ask her what Christians believe, and she is most likely to list many doctrinal points I omitted, and may or may not get around to adding anything that I listed above.

Well, yes. That just goes to confirm what was said earlier about the creeds being enumerations of the distinctive points of Christianity as opposed to, say, Buddhism or Islam; likewise, the question "What do Christians believe?" carries an implicit rider of "...compared to anyone else?". Most Christians believe that Providence is the capital of Rhode Island, too (assuming they've heard of the place) but that doesn't make it on to a list of distinctive things believed by most Christians because so does everyone else. The danger is assuming that what's distinctive is exhaustive.