The Nazi party's ideology was based on the belief that the German people were superior to all other races, and that the Jews were an inferior race that should be exterminated. This ideology was reflected in the party's policies, which included the persecution of Jews, the Holocaust, and the Second World War.
Hitler's role in the Nazi party's racism was significant, but he was not the only one responsible for it. The party's ideology was developed by a number of people, including Alfred Rosenberg, Julius Streicher, and Heinrich Himmler. Hitler's role was to provide leadership and support for the party's racist policies.