He's completely delusional.
After Scalia and Senior discussed heaven and hell (he believes in them; she doesn't), the justice said in a stage whisper, "I even believe in the devil."
"You do?" Senior replied.
"Of course! Yeah, he’s a real person. Hey, come on, that’s standard Catholic doctrine! Every Catholic believes that," Scalia said.
Senior asked Scalia if he's seen evidence of Satan's work recently.
"You know, it is curious," Scalia answered. "In the Gospels, the devil is doing all sorts of things. He’s making pigs run off cliffs, he’s possessing people and whatnot. And that doesn’t happen very much anymore. ... It’s because he’s smart."
Scalia said the Devil has gotten "wilier" and convinced people that he and God don't exist. The justice added that he doesn't think that atheists are Satan's minions, but that disbelief in God "certainly favors the devil's desires."
Senior asked if it's "frightening" to believe in the devil, which seemed to annoy Scalia.
"You’re looking at me as though I’m weird," he answered. "My God! Are you so out of touch with most of America, most of which believes in the devil? I mean, Jesus Christ believed in the devil! It’s in the Gospels! You travel in circles that are so, so removed from mainstream America that you are appalled that anybody would believe in the devil! Most of mankind has believed in the devil, for all of history. Many more intelligent people than you or me have believed in the devil."
Here's the full conversation if anyone is interested to read it.
Holy fuck. That's nuts.
Also, the first link is broken. There's a space in it.
It blows my mind whenever I hear that there are adults who fully believe all that bullshit - I can't even fathom someone of Scalia's credentials clinging to such malarkey.