Christianity and Early Rabbinic Judaism were far less orthodox and less theologically homogeneous than in modern day. Both religions were significantly influenced by Hellenistic religion and borrowed allegories and concepts from Classical Hellenistic philosophy and the works of the Greek-speaking Jewish authors of the end of the Second Temple period. The two schools of thought eventually firmed up their respective "norms" and doctrines, notably by increasingly diverging on key issues such as the status of "purity laws", the validity of Judeo-Christian messianic beliefs, and, more importantly, the use of Koine Greek and Latin as sacerdotal languages replacing Biblical Hebrew. Trajectory Heinrich Graetz postulated a Council of Jamnia in 90 that excluded Christians from the synagogues, but this is disputed. Jewish Christians continued to worship in synagogues for centuries. According to historian Shaye J. D. Cohen, "the separation of Christianity from Judaism was a process, not an event", in which the church became "more and more gentile, and less and less Jewish". According to Cohen, early Christianity ceased to be a Jewish sect when it ceased to observe Jewish practices, such as circumcision. According to Cohen, this process ended in 70 CE, after the great revolt, when various Jewish sects disappeared and Pharisaic Judaism evolved into Rabbinic Judaism, and Christianity emerged as a distinct religion. Talmudist and professor of Jewish studies Daniel Boyarin proposes a revised understanding of the interactions between nascent Christianity and Judaism in late antiquity, viewing the two "new" religions as intensely and complexly intertwined throughout this period. According to Boyarin, Judaism and Christianity "were part of one complex religious family, twins in a womb", for at least three centuries. Alan Segal also states that "one can speak of a 'twin birth' of two new Judaisms, both markedly different from the religious systems that preceded them". According to Robert Goldenberg, it is increasingly accepted among scholars that "at the end of the 1st century CE there were not yet two separate religions called 'Judaism' and 'Christianity. Jewish Christianity fell into decline during the Jewish–Roman wars (66–135) and the growing anti-Judaism perhaps best personified by Marcion of Sinope (c. 150). With persecution by the Nicene Christians from the time of the Roman Emperor Constantine in the 4th century, Jewish Christians sought refuge outside the boundaries of the Empire, in Arabia and further afield. Within the Empire and later elsewhere it was dominated by the gentile-based Christianity which became the