Traditional Jews who look at the details do not believe any such thing.
Peter Schafer is a Christian, by the way, who is held in high regard by the Judaism haters in the nihilistic secular Jewish world.
Perhaps you mean Jews like Maimonides?
I paste below an excerpt from his Epistle to Yemen wherein he restates succinctly some of the basic ideas concerning Jesus and Mary contained in the Talmud which, as you know, he influenced greatly. So, c'mon. Maimonides himself believed that these stories related to the Christian Jesus.
The first one to have adopted this plan was Jesus the Nazarene, may his bones be ground to dust. He was a Jew because his mother was a Jewess although his father was a Gentile. For in accordance with the principles of our law, a child born of a Jewess and a Gentile, or of a Jewess and a slave, is legitimate. (Yebamot 45a). Jesus is only figuratively termed an illegitimate child. He impelled people to believe that he was a prophet sent by God to clarify perplexities in the Torah, and that he was the Messiah that was predicted by each and every seer. He interpreted the Torah and its precepts in such a fashion as to lead to their total annulment, to the abolition of all its commandments and to the violation of its prohibitions. The sages, of blessed memory, having become aware of his plans before his reputation spread among our people, meted out fitting punishment to him.
I believe that Christians and Jews have so much in common that we don't need to sugarcoat the nasty things we've said about each other ages ago. Let's start by getting honest about what these texts are and what they always meant