I think you'll really like some of the more elaborate discussions Seishin and Sunako have had and will have in the novel. Still, the manga and the anime both captured the end distinctly, so that they cut much of the more explicit talk (though a lot of it's still in the episode previews where it's just Seishin monologuing) I generally think they captured the feel well.
One thing that's interesting to me is Seishin's concept of God/religion; it's a creed or a code more than, say, a deity or a certain consciousness or entity. It's like the 10 Commandments rather than the God who passed them down, in Judeo-Christian terms. By Seishin, I imagine certain alignments (political, etc.) would be "religion" to him. It seems like a very Buddhist concept. I don't really know a terrible lot about Buddhim and its different sects, granted, and Shiki's shown us parts of traditional Buddhism are certainly entity-conscious, but.
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One thing that's interesting to me is Seishin's concept of God/religion; it's a creed or a code more than, say, a deity or a certain consciousness or entity. It's like the 10 Commandments rather than the God who passed them down, in Judeo-Christian terms. By Seishin, I imagine certain alignments (political, etc.) would be "religion" to him. It seems like a very Buddhist concept. I don't really know a terrible lot about Buddhim and its different sects, granted, and Shiki's shown us parts of traditional Buddhism are certainly entity-conscious, but.