I read parts of this and found them quite interesting! One of the annoying things about schizophrenia is when someone you care about is in treatment/remission/managing their symptoms, if they use metaphor or symbolism or other similar linguistic devices it can be hard to tell if they are doing that - intentionally using metaphor/symbolism/imagery to make a point, or if they are veering off into a strange delusional s…
The front half of the book, up until a clear pivot chapter, is me trying to put to words a coherent schizophrenic vision; both to establish credentials and to give people a sense of what it can be like.
A common theme I've seen both in myself and in others who have spoken to me about their experience is that it's common to have a delusion that you are at the center of a religion.
Personally, I've been blessed with insights at the core of every major religion that I know more than a slight deal about. It just so happens that the episode I detail in this book has me at the center of a prophecy; It rings in my head as truth, but I don't have any proof of that truth to produce.
In the latter half of the book, I introduce a conversation with Master Yoshu that I feel is critical to the message. It would have been awkward to say, "I heard this from a voice" without the setup to give that.
Regarding your last paragraph, I think what you'll find is that life is rarely ever centered around something that you can ever adequately put to words. Even if someone is always 100% literal, their concepts will not match your concepts; labels are the source of much of our suffering, and trying to label something as example or metaphor or "not literal" already betrays that you're unable to falsify it; thus, there's something to it.
I don't want to dismiss you though: If I went through that burden of categorizing my own text, how would your life be improved?