I am going to attempt canon summaries, although in some parts it is difficult to tell what is Adler's analysis and what is Rowling:
- Jo thought explicit references to Christianity early on in the story would make the ending too obvious.
- JKR: "Hogwarts is a multifaith school."
- The Matthew 6:21 and 1Corintians 15:26 quotations on his parents' gravestones were meant to symbolize "living beyond death. Living after death." They "sum up" the whole series.
- Harry's struggle with questions about the afterlife begins when Sirius dies.
- The two epigrams at the beginning of Book 7 ("The Libation Bearers" by Aeschylus and William Penn's "More Fruits of Solitude") had been planned since book 2 was published: "I always knew [that] if I could use them at the beginning of book seven then I'd cued up the ending perfectly.... They just say it all to me...."
- Harry's struggle with his beliefs about the afterlife mirrors her own.