While Castiel knew that nothing had been meant by it, the way that Kratos phrased the question hit harder than expected. What was he originally? The implication was that he was no longer what he'd once been, and it wasn't something he could necessarily refute.

The words came out nonetheless. "This vessel doesn't make me any less of one, but..." He paused, looking from the hymnals up to the stained glass. Even though it was in abstract patterns, the source was still clear. Perhaps Kratos didn't know that, but it was something Castiel was keenly aware of. He could he not be?

"I'm an angel. From the Judeo-Christian religion," he finished, moving his head to look directly at Kratos, expecting a reaction. Once again, the significance might be lost on Kratos depending on his origins, but in some ways that made it easier to say. The man wouldn't necessarily have any expectations.