Today I was listening to the (Aust) ABC and a speaker made a very good point. He said that Jesus was a Jew and once all the symbolism and myths in the "New Testament" are removed, he remained one. He said his teaching style was classic for Nazareth where he was raised by using parables and not writing anything down (he/they were uneducated) He noted that there were "Christian" groups which attended Christian meetings one day then went to the Synagogue on another up until the yr 150CE.
His point was that Christianity was a Roman concept.