Divine Inspiration Via Philip K. Dick
"The Divine Invasion" by Philip K. Dick is actually a sequel to another PKD book called "Valis." The Divine Invasion is structured with a traditional, science-fiction narrative, while Valis is (definitely) not. Valis, while having a plot, is (in my opinion) a book length series of deeply fascinating, creative, inspired and psychotic journal entries. The entire length of Valis includes philosophy, mysticism, psychology, mythology and religious insights and extrapolation, from any (and every) source. Overall, Philip K. Dick called this wealth of knowledge his "Exegesis." The total Exegesis itself is approximately 8,00o pages. I'd encourage you to read Valis if you want to enter a rabbit hole and then never come back. I'm still in there myself.