Crossbro, you said you are "curious" as to "where does the anti-Semitism from Christians come from ?"
I'll take you at your word.
Ignoring the long history of Jєωιѕн financial depredation across many countries and cultures, and also ignoring the long history of ritual murders of Christian children by psychotic Jєωs (likely a minority practice but always defended by Jєωry as a whole), and ignoring the long history of Jєωιѕн revolutionary overthrow of Christian societies, let's dip into the тαℓмυd and see what the Elders of Zion have to say about Christ and his mother with other assorted bits of lunacy.
“...
Jesus shares his place in the Netherworld (hell) with Titus and Balaam, the notorious arch enemies of the Jєωιѕн people. Whereas Titus is punished for the destruction of the Temple by being burned to ashes, reassembled, and burned over and over again, and whereas Balaam is castigated by sitting in hot semen,
Jesus’ fate consists of sitting forever in boiling excrement.” —Peter Schäfer, Jesus in the тαℓмυd (Princeton University Press), p. 13. BT Gittin 57a.
Mary, the Mother of Jesus, was a prostitute. —BT Sanhedrin 106b. BT Sanhedrin 67a. Shabbath 104b.
All gentile women without exception are: “Niddah, Shifchah, Goyyah and Zonah” (menstrual filth, slaves, heathens and prostitutes). —BT Sanhedrin 81b - 82a.
BT Kiddushin 66c: “
The best of the gentiles: kill him; the best of snakes: smash its skull; the best of women: is filled with witchcraft.” The uncensored version of this text appears in Tractate Soferim (New York, M. Higer, 1937), 15:7, p. 282.
Rabbinic authorities decree that a building set aside for actual (rather than feigned) worship of Jesus Christ is a house of avodah zarah. —Yayin Malchus, 234-237. Minchas Elazar 1:53-3. Yechaveh Da'as 4:45. Darchei Teshuvah 150:2. Tzitz Eliezer 14:91.
Therefore, when passing a church they utter a curse upon it as follows: “Beis gee'im visach Hashem.” —Birkath ha-Minim, 12th Amidah. BT Berakhot 58b.
Only Jєωs are human. Non-Jєωs are not human. —BT Bava Metzia 114b. BT Kerithoth 6b and 58a.
Regarding a Jєω
stealing from a non-Jєω, the act is permitted. — BT Sanhedrin 57a.
Jєωs may use lies ("subterfuges") to circuмvent a gentile.
—BT Baba Kamma 113a.
If a Jєω is tempted to do evil, he should go to a city where he is not known and do the evil there. —BT Moed Kattan 17a.
It was a Jєωιѕн convert, Nicholas Donin, who informed the Church of what the Jєωs' тαℓмυd contained. Circa 1230. People should find Michael Hoffman's
Judaism's Strange Gods. His site has other works on this important subject.