Birkat haMinim

Jewish rabbis began to widely include Christians in their liturgical curse on heretics (the Birkat haMinim, also referred to as the Twelfth Benediction) after Christians refused to participate in the First Jewish Revolt when Rome destroyed Jerusalem and the temple in 70 CE and in the Bar Kokhba revolt (132–136 CE). Afterwards, Romans no longer considered Christianity to be a Jewish sect and Christians lost the allowances Romans offered Judaism. Contrary to common belief, there was no definitive date when this separation occurred.