... the process of separation from the end of the first century C.E. until the period of the Bar Kokhba Revolt (132-135 C.E.), when the tannaim outlawed the writings of the early Christians, declaring that Torah scrolls or texts with divine names copied by Christians had no sanctity. This was clearly a polemic against the Gospels, which must have been circulating in some form by now.

from http://mobile.myjewishlearning.com/history/Ancient_and_Medieval_History/539_BCE-632_CE/Palestine_Under_Roman_Rule/Jewish-Christian_Schism.shtml