WE KNOW OF AS ORTHODOXY & HERESY PROVIDES AT LEAST ONE CRUCIAL SITE FOR THE EXCAVATION OF A GENEALOGY OF JUDAISM & Christianity.
The idea of orthodoxy comes into the world some time in the second century with a group of Christian writers called "heresiologists," the an atomizers of heresy & heresies - inscribed the border lines, & heresiologists are the inspectors of religious customs.
Ancient heresiologists tried to police the boundaries so as to identify & interdict those who respected no borders, nomads who would not recognize the efforts to institute limits, to posit a separation between "two opposed places," & thus to clearly establish who was & who wasn't a "Christian," a "Jew."
Authorities on both sides tried to establish a border, a line that, when crossed, meant that someone had definitely left one group for another. They named such folk "Judaizers" or MINIM, respectively, & attempted to declare their beliefs & practices, their very identities, as out of bounds.
Groups that are differentiated in various ways by class, ethnicity, and other forms of social differentiation become transformed into "re-lions" in large part, DB suggests, through discourses of orthodoxy/heresy!
People attending f.i. both synagogue & church in 3rd-century Caesarea are "smugglers" who transported discourses of martyrology in both directions across the "abstract, legal, & ideal" frontier be-tween Judaism & Christianity; we can add here "Jewish Christian" communities, such as that of the Pseudo-Clementine productions.
We do not of course claim that terms such as ETHNICITY & CLASS are unhistorical givens; we just use these terms as convenient shorthand for various modes of group identity-making!
Early Christian heresiology, whatever else it is, is largely the work of those who wished to eradicate the fuzziness of the borders, semantic & social, between Jews & Christians & thus produce Judaism & Christianity as fully se-parate (& opposed) entities - as religions, at least in the eyes of Christianity.
Karen King has made the point that for early Christian writers "heresy" was always defined with respect to Judaism; too much Judaism & you were a Judaizer, too little, a "gnostic" ...