Here's an interesting exhibit: the Museum of the Art and History of Judaism, in Paris, is documenting the Jewish origins of the comic strip. As an article on the exhibit in Le Monde points out, all the great superheroes were created by Jews. It also relates the interesting story that after seeing a World War II-era Superman in which the Man of Steel crushes Nazi Germany, Joseph Goebbels was said to write, "Superman is Jewish!"
This exhibit may cause some dismay to those who want only to stress Superman's universalism.