"He is! He really is!" Diarmuid doesn't seem bothered that she hasn't heard of his father. He's been in the city long enough to know that not all worlds have the same kind of belief system his does, so of course they have different gods.

"He made me a butterfly so that I never have to be alone. See!" Diarmuid holds out his hands and a few moments later a small, blue and green butterfly appears out of his hair and lands in his hands, "This is Little Dia! He helps me out with things!"