Check out Mike's signature at the bottom. The letters after it are 'ANG'. I always took that to indicate that he was indeed an angel. And doesn't he indicate at some point that he's Lois's guardian angel? Clark's? Sorry, haven't watched the episode in way too long, but I have a distinct memory of the term guardian angel being used early on. I could be making that up as I go along though.
I think he was everyone's guardian angel. I'm pretty sure Jimmy recognized him, too.
I didn't really care for the angel thing there, either. I don't care whether or not there's a religious aspect to any given show, just didn't think it really contributed anything. Plus, the angel didn't even bother to tell them they couldn't consummate the marriage - and you'd think he'd know about their souls.
