For the Jewish community of Palestine, the years between 80 and 130 C.E. were simultaneously years of reconstruction of the country and preparation for the Bar Kokhba Revolt. Throughout this period Christianity continued to grow while its Jewish element was being reduced. In actual fact, the juridical basis for the Gentile domination of Christianity was laid in the time of Paul, when the legitimacy of Gentile Christianity was established. The effect of these actions was not actually felt by the tannaim until the early years of the second century.
By the time of the Bar Kokhba war (132-5 C.E.), Gentile Christianity had most probably still not taken over the Jerusalem Church nor become the dominant element in the Palestinian Christian community. Accordingly, the tannaim would still have seen the early Christians as Jews.
Read the rest, and the whole series.