contradiction, going back to Paul of Tarsus, of Jews being both enemy and friend, writing: "The Jews are not odious to God for the very reason they are Jews; for how could this have happened since they were embellished with so many great gifts...." Contrasted with antisemitism "The terms 'anti-Judaism' (the Christian aversion toward the Jewish religion) and 'antisemitism' (aversion toward the Jews as a racial or ethnic group) are omnipresent in the controversies over the churches' responsibility with regard to the extermination of the Jews" and "since 1945, most of the works on 'anti-Semitism' have contrasted this term with 'anti-Judaism. According to Jeanne Favret-Saada, the scientific analysis of the links and difference between both terms is made difficult for two reasons. First is the definition: some scholars argue that anti-Judaic refers to Christian theology and to Christian theology only while others argue that the term applies also to the discriminatory policy of the churches [...]. Some authors also advance that eighteenth-century catechisms were "antisemitic" and others argue that the term cannot be used before the date of its first appearance in 1879. The second difficulty is that these two concepts place themselves in different contexts: the old and religious for the anti-Judaism' the new and political for anti-Semitism. As examples regarding the nuances put forward by scholars: Leon Poliakov, in The History of Anti-Semitism (1991) describes a transition from anti-Judaism to an atheist anti-Semitism going in parallel with the transition from religion to science, as if the former had vanished in the later and therefore differentiating both. In The Aryan Myth (1995) he nevertheless writes that with the arrival of anti-Semitism, "the ineradicable feelings and resentments of the Christian West were to be expressed thereafter in a new vocabulary". According to Jeanne Fabret, "[if] there were fewer Christians going to church during the age of science, [...] religious representations kept shaping minds. For Gavin Langmuir, anti-Judaism is concerned with exaggerated accusations against Jews which nonetheless contain a particle of truth or evidence, whereas antisemitism reaches beyond unusual general inferences and is concerned with false suppositions. Thus Langmuir considers the labelling of Jews as 'Christ-killers' is anti-Judaic; accusations of well-poisoning, on the other hand, he regards as antisemitic. In his view, anti-Judaism and antisemitism have existed side by side from the 12th century onwards and have strengthened each other ever since. The blood libel is another example of antisemitism, though