But the dialogue really plays out like Roy would be pretty bummed if he got sent to the NG afterlife. The scene really loses its impact if it doesn't matter so much whether he "gets in" or not.
Edit: The link in this post also includes this quote from the Deva: "They figure that if they can't manage it perfectly every waking second, then they should just pick some other alignment because it'll be easier." This comes directly as she's explaining why she doesn't chuck Roy down to the NG afterlife.