Slimboyfat,
In my opinion "Christianity," or "the Christian faith," is not historically, currently or potentially as monolithic as you seem to imply -- and was certainly even much less so in its incipient stages, prior to its Catholic (or orthodox) standardisation.
"Jesus dying for us" now sounds as an unnegotiable element of Christian faith. It is certainly present in the N.T. (although the "for" part actually covers a large variety of contradictory interpretations -- such as expiation, propitiation, ransom, but also as a figure of lifegiving wisdom, or a model of dying to the world/ourselves. Whether it was actually shared by all segments of the early Christian nebula is another matter. If, for instance, the Sermon of the mount exposes anything like a "Christian way of salvation" we must acknowledge that "Jesus dying for us" plays absolutely no part in it: salvation depends on what you do, not what you believe has happened sometime in the past.
Of course the kind of Christianity which eventually defined itself through rejection of Gnosticism and Docetism has a vested interest in history (i.e., the history it wrote up as its own foundation). This is a historical choice (and a rather shortsighted one if you ask me).
The concept of "salvific events" is a highly problematic one when you come to think of it (and this has not been missed by Christian theology). Historical events per se do not "save" anybody (at least in the otherworldly sense of Christian "salvation") without the mediation of the anhistorical -- be it theology or mythology. There is no inherent religious difficulty in the idea of a "god" saving his worshipers after death, or even leading history to an end and new beginning in apocalyptical fashion, even though he has never "become flesh" or set foot on this earth. On the other hand, the crucifixion of a historical man would not save anybody without the superposition of a non-historical narrative (e.g., he was actually a god coming down from heaven, or he cancels a mysterious debt in an equally mysterious somewhere, etc.).