In the original book, the character wasn't Jewish

When the Nazis rounded up the Jews they all responded by naturally fabricating false Aryan genealogies. When they were schoolboys together at Linz, Adolf Hitler shouted filthy Jew at the precocious genius Ludwig Wittgenstein. Wittgenstein was shocked because he had no idea he was Jewish. The Wittgensteins were antisemitic semites forbidden from marrying Jews. Hitler wrote a poem describing how bloodtests revealed ethnicity in mockery of their genealogical efforts.
If Suss is Aryan then his fidelity is Aryan. The propensity to Semitic betrayal is so remorselessly pursued throughout the book that it becomes inconcievable Suss could have chosen this option had he been innately Jewish.
Thre original book is remorselessly antisemitic.

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If one practices Judaism one is a Jew irrespective of origin. Someone who denounces Judaism and accepts another religion is no longer a Jew irrespective of his origin. The character in the 1934 British film was a Jew by religion and thus a Jew, as demonstrated in his heroic end-of-life behavior. The character in the 1940 Nazi film was a mockery of Judaism. I HAVE NEVER KNOWN ANY RELIGIOUS JEW TO ACT LIKE THE NAZI STRAWMAN CHARACTER. Bolsheviks of Jewish origin? Sure, but they are as hostile toward Judaism as toward Christianity, and their amorality mocks the heritage of their ancestors.

I saw another story -- that Suess was the son of a Jew by a gentile German woman and was raised as a Christian. In that case Suess Oppenheim would have 'only' been a "Mischling" who would have been subjected to horrible mistreatment most likely short of murder so long as he didn't identify with Jews. He was baptized as a Christian, and he never identified himself as a Jew. Thus the character's infamous 'exposure' of the "Jewish God" as a god of hatred and revenge would have been a plot hole except in the Demonic Reich.

But whether 'my story' or that of the British film is correct, the star character of the Nazi-inspired bilge is a racist falsification. That character who shows angry, racist contempt at Christian morals violates the norms of religious Judaism.

The essential crime that made the Holocaust possible was that Jews no longer got the chance to defend themselves from an onslaught of calumnies that got viler and severer in intensity as nothing could stop them. Jews didn't get to defend the content of their religious beliefs and their culture. They didn't get to show that Judaism was entirely consistent with German culture -- or even that the Yiddish language of Jews in eastern Europe was clearly German in origin. I question whether a liar like Joseph Goebbels could have well withstood a debate with Martin Buber.

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