The thread is concerning our opinion of which book has influenced history the most. It's pretty simple, dude. There's no need to consider the unification o cultures, nor to choose a book which has influenced all cultures.
You've raised one good point (to consider China and India), and I would therefore add the following to a broader list:
- Lao Tzu's "Book of Changes" (I Ching)
- The Bhagavad Gita
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