So...uh...I have here a powerful devil who holds no ill will toward heaven, isn't the least bit evil and actually seems to revere God to a degree. And could somehow stand in a church without ill effects, though there are a couple reasons I can think of why it might not have counted as properly holy.

He's also going through a bit of a confusing period in his life as he tries to get into the habit of judging himself by his own standards of right and wrong rather than the underworld's, so how would that power work for someone who isn't sure what he considers his most and least honorable moments?

As for canon puncture, he's from Devil May Cry and Viewtiful Joe, though he's only a sword in the former and is the only major religious reference in the latter. Still, feel free to bring up that he's fictional. He won't be at all surprised, though, since his fourth wall is incredibly flimsy. Or feel free to recognize his name, Alastor, as a reference to Greek mythology, commonly associated with his power set as another name for Zeus.

I also have a disillusioned priest from Xenosaga, which is absolutely loaded with religious references. He...might not be too comfortable dealing with an angel strike>even though he gained a Persona that manifests as one, since he was utterly and completely betrayed by his religion :D But he's been through enough by now that being fourth walled wouldn't exactly shatter his world.

Oh yeah! Since Alastor is a devil and has all kinds of supernatural senses, I'm assuming he'd be able to recognize 'oh hey, this guy reeks of holy'?