I wanted to point out the cover of the "Absolute" edition of Kingdom Come, which puts the story's religious symbolism right up front. It depicts the Spectre stepping out of a stained-glass window into the church pastored by Norman McCay. (McCay is modelled on Clark Norman Ross, the artist's father and a real-life minister.) Kingdom Come is mostly centered on Superman, but the Spectre is an interesting character in his own right. Created by Jerry Siegel (one of the creators of Superman) in 1940, he has over the years become one of the metaphysical/theological mainstays of the DC Universe. If there's a big mystical story to be told, the Spectre will usually get involved somehow. I mean, c'mon: a guy who can dramatically step out of a stained-glass window without breaking it is pretty cool.