It’s a bird. It’s a plane. No, it’s … Jesus? When Jerry Siegel and Joe Shuster created their iconic comic book hero Superman in 1938, their character wasn’t just a representation of “Truth, Justice and the American Way,” but for many, a metaphor for Jewish immigrants in 1930s America. Created by two young Jewish men, Superman was an allusion to the Jewish faith and history, from his baby Moses-like origins to his golem-esque invincibility, to his outcast status and his ultimate struggle to assimilate in a new land. But somewhere along his journey since 1938, Kal-El converted to Christianity, which...