From what point-of-view is "By the Waters of Babylon" written? How do you know?

By the Waters of Babylon is written in the first person.  You can tell this right away because the protagonist, John, says the word I throughout the story.  Thus, the story is told from his point of view which is first person.

“My father is a priest; I am the son of a priest.  I have been in the Dead Places near us with my father; at first I was afraid…"