(1) Atheist Morton Smith is a genuine scholar. In his unique book, "Jesus the Magician," he reconstructs the version of Jesus' life as told by His Jewish detractors. I have summarized his findings in the paragraph below. The main source is the Platonist Celsus, who interviewed Jewish leaders to get their version of Jesus' life. Some of what they share can be independently corroborated by earlier sources traceable to the first century. I have cited other sources in parentheses for certain negative Jewish traditions about Jesus.
Jesus is the illegitimate son of a Roman soldier named Panthera and a spinner woman (Rabbi Eliezer--70 AD). Her husband disowned her for her adultery and Jesus was born while she was on the run. He got a job in Egypt as a laborer and took the opportunity to become an adept in magic there. Jesus even had himself tattooed with magical spells (Celsus--170 AD--also responsible for the ensuing claims). Returning to Galilee Jesus hung out with sailors of the worst sort, and wandered from place to place, making his living shamefully as a beggar. He recruited 10 (not 12) disciples and taught them to indulge in secret orgies in defiance of the Law of Moses. He persuaded the masses that he was the Messiah by his miracles, which were either demonically powered or nothing more than magically induced hallucinations. His cures were not real and did not last (Quadratus--100-125 AD). Even his own family rejected his claims. He was tried and executed by Pilate for sedition and the practice of magic. His disciples stole his body and then claimed that they saw him after he rose from the dead. Some say the gardener at the tomb site removed the body to discourage sightseers from stepping on his lettuce (Tertullian--208 AD). But the false claim that he rose from the dead has gained him a huge following.
That Myth was first created,
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Origen, Contra Celsum 1.32 (248 CE)
But let us now return to where the Jew is introduced, speaking of the mother of Jesus, and saying that “when she was pregnant she was turned out of doors by the carpenter to whom she had been betrothed, as having been guilty of adultery, and that she bore a child to a certain soldier named Panthera;” and let us see whether those who have blindly concocted these fables about the adultery of the Virgin with Panthera, and her rejection by the carpenter, did not invent these stories to overturn His miraculous conception by the Holy Ghost: for they could have falsified the history in a different manner, on account of its extremely miraculous character, and not have admitted, as it were against their will, that Jesus was born of no ordinary human marriage. It was to be expected, indeed, that those who would not believe the miraculous birth of Jesus would invent some falsehood. And their not doing this in a credible manner, but (their) preserving the fact that it was not by Joseph that the Virgin conceived Jesus, rendered the falsehood very palpable to those who can understand and detect such inventions. Is it at all agreeable to reason, that he who dared to do so much for the human race, in order that, as far as in him lay, all the Greeks and Barbarians, who were looking for divine condemnation, might depart from evil, and regulate their entire conduct in a manner pleasing to the Creator of the world, should not have had a miraculous birth, but one the vilest and most disgraceful of all? And I will ask of them as Greeks, and particularly of Celsus, who either holds or not the sentiments of Plato, and at any rate quotes them, whether He who sends souls down into the bodies of men, degraded Him who was to dare such mighty acts, and to teach so many men, and to reform so many from the mass of wickedness in the world, to a birth more disgraceful than any other, and did not rather introduce Him into the world through a lawful marriage? Or is it not more in conformity with reason, that every soul, for certain mysterious reasons (I speak now according to the opinion of Pythagoras, and Plato, and Empedocles, whom Celsus frequently names), is introduced into a body, and introduced according to its deserts and former actions? It is probable, therefore, that this soul also, which conferred more benefit by its residence in the flesh than that of many men (to avoid prejudice, I do not say “all”), stood in need of a body not only superior to others, but invested with all excellent qualities.
Translated by Frederick Crombie.
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It was later added to the Talmud 500 year later,
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Babylonian Talmud, Shabbat 104b (c. 500 CE)
It is taught that Rabbi Eliezer said to the Wise, “Did not Ben Stada bring spells from Egypt in a cut in his flesh?” They said to him, “He was a fool, and they do not bring evidence from a fool.” Ben Stada is Ben Pantera. Rabbi Hisda [d. 309] said, “The husband was Stada, the lover was Pantera.” The husband was [actually] Pappos ben Judah, the mother was Stada. The mother was Miriam [Mary] the dresser of women's hair. As we say in Pumbeditha, “She has been false to [
satath da] her husband.”
Translated by Robert Van Voorst (2000).
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http://www.jasoncolavito.com/pantera-father-of-jesus.html