1. Well, the myth goes something like this: In the beginning was "us" (i.e. me, since all the first Christians held the same beliefs that I did, they hated the same false teachings that I hate, my distinctives were their distincitives). Things went well for us until about 100 AD when it all turned to a schmozzle and we disappeared. But the good news is that "us" is back and we have brought with us a return to the pristine era of doctrinal purity. We are the gatekeepers of truth and righteousness and the boundary of the kingdom includes us and our friends. In the immediate sense, all before us and all apart from us are dogs and devils. (Note, this is a caricature and an exageration and I do not have any body or any group in mind).
2. On another level, when students (esp. evangelical students) talk about the message of the New Testament, they usually mean Paul. And when they mean Paul, what they mean is Romans and Galatians. Their understanding (or sometimes lack of undestanding) of these two epistles often becomes the centre of not only Paul, but of the entire New Testament. Hebrews, Matthew, Revelation, and Luke-Acts are all forced into a Pauline framework.