I don't think they're anything like actual angels, if that's what you're asking. Angels kill a lot faster than that.

[ Especially Crowley. He knows what it feels like to be attacked by an angel. These things are powerful, but they're not holy. They don't hurt the same way at all. ]

Whatever they are, I don't think they can move through walls. It would be in here already if it could, don't you think? We seem relatively safe for now.