Judaism
Christianity was originally a sect of Second Temple Judaism, but the two religions diverged in the first century. The differences between Christianity and Judaism originally centered on whether Jesus was the Jewish Messiah but eventually became irreconcilable. Major differences between the two faiths include the nature of the Messiah, of atonement and sin, the status of God's commandments to Israel, and perhaps most significantly of the nature of God himself. Due to these differences, Judaism traditionally regards Christianity as Shituf or worship of the God of Israel which is not monotheistic. Christianity has traditionally regarded Judaism as obsolete with the invention of Christianity and Jews as a people replaced by the Church, though a Christian belief in dual-covenant theology emerged as a phenomenon following Christian reflection on how their theology influenced the Nazi Holocaust.
Panarion
The first section of the first of the three books contains an account of 20 heretical sects before the time of Jesus; the remaining portion is occupied with the description of 60 sects of Christianity. However, the total number of sects is actually 77, because three of the first 20 are general names: Hellenism, Samaritanism, and Judaism. In the editions of the "Panarion", each heresy is numbered in order; hence it is customary to quote the "Panarion" as follows: Epiphanius, "Haer." N [the number of the heresy].