They had a huge impact- creating a global wave of anti-semitism.
Explanation:
Especially during the 19th century, before the rise of Nazi Germany, pseudoscience on the basis of religion was extremely prevalent. These pseudoscience made outlandish claims like "Jewish people aren't human" or "Jewish people work for the devil." This anti-semitism created a wave which spread like wildfire across the globe - eventually leading to horrible, oppressive conditions for Jewish people.
