I just saw Constantine. I must admit, I kinda liked it. Maybe it was the mood I was in. Anyway, questions:
[/spoiler]
Constantine was suffering from lung cancer – I forgot exactly when they explained it in the movie, but it was based on the Hellblazer comic book story “Dangerous Habits” by Garth Ennis. At the end, Satan removed the cancerous growth Constantine’s lungs to save his life, since at that point if he had died, he would have ascended to heaven. Satan just wanted him to stay alive longer, since he had bigger, worse plans for him.
So much for “Spoiler boxes enabled.” 
So Satan pulled the cancer out of him. And put the blood back in? And repaired his wrists?
(Actually, I feel pretty stupid looking back on it now. Of course it was his cancer being removed.)
#1: IIR my Hellblazer mythos correctly, angels are androgynous creatures, neither male nor female. I’m assuming they cast Tilda Swinton because she looked the part, especially in a “mannish” costume.
#2: I can’t remember, been too long since I watched it.
#3: There was a scene early on (I think around the time we saw the twin sister’s suicide) where Constantine was talking to a doctor about his lung cancer, including how long he had to live. It wasn’t much, so Satan fixed that in addition to healing up John’s slashed wrists.
As the Onion AV Club so eloquently stated:
I find Tilda Swinton damn sexy no matter how many men she pretends to be (Constantine, Orlando).
I do too, you’re not alone. Something about her just makes me think she’d be a blast to be around as well as great in the sack.
I third that–she makes a fabulous White Witch in Chronicles of Narnia, and by all accounts she’s very kind and funny on-set.
- No specific gender, though I concur with the still hot assesment
- I don’t think so, just trying to find it’s feet, so to speak
- Lung cancer, give him time enough to fall from grace again.