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That gentiles are not human is written in the holiest books of the Jews: the Talmud
Some quotes from the Talmud
Sanhedrin 57a . When a Jew murders a gentile ("Cuthean"), there will be no death penalty. What a Jew steals from a gentile he may keep.
Baba Kamma 37b. The gentiles are outside the protection of the law and God has "exposed their money to Israel."
Sanhedrin 58b. If a heathen (gentile) hits a Jew, the gentile must be killed.
Sanhedrin 57a . A Jew need not pay a gentile ("Cuthean") the wages owed him for work.
Baba Mezia 24a . If a Jew finds an object lost by a gentile ("heathen") it does not have to be returned. (Affirmed also in Baba Kamma 113b). Sanhedrin 76a. God will not spare a Jew who "marries his daughter to an old man or takes a wife for his infant son or returns a lost article to a Cuthean..."
Yebamoth 98a. All gentile children are animals.
Abodah Zarah 36b. Gentile girls are in a state of niddah (filth) from birth.
Abodah Zarah 22a-22b . Gentiles prefer sex with cows.