I don't care who knows. There's no Apocalypse here, what does it matter? If they can figure it out, good for them. Give 'em a shiny gold star and everyone goes away happy.

[He shakes his head, apparently unimpressed by all of this tact and diplomacy nonsense. He does care who knows, of course. Hiding his identity has been one of his priorities for centuries, and that's not easily put aside, even if 'coming out' back home hadn't had all those rather unpleasant consequences. But honestly, it isn't as important here. It could lead to a couple of arguments, especially if there are any people with strong feelings about religion around, but he's not exactly opposed to arguments. If tradition is the only real reason to keep up the pretence, it's not worth making a fuss over.]

And if they're rude, smite 'em where they stand. That'll prove you're for real and get rid of a complete pain in the ass - two birds with one stone. I'm not seeing a problem here.