Last summer's top-grossing movies: "Guardians of the Galaxy" from Marvel Comics, "Spiderman" and "Wonder Woman." Superheroes are big with audiences. Meanwhile, organized religion has declined in this country. Is that a coincidence? Or are superheroes the new religion? We talk with Reza Aslan, author of "God: A Human History," and Seattle writer G. Willow Wilson, author of the latest Ms. Marvel series.