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Your challenge is with any PoD, to flip the demographics of the 10 most common religions in the world. This is a very rough graph and omits stuff like atheism and agnosticism, as well as indigenous/tribal religions as they are so diverse that grouping them together makes no real sense outside convenience in a graph. If you have better data, feel free to correct me.
  1. 2.2 Billion Zoroastrians
  2. 1.7 Billion Jains
  3. 1.1 Billion Bahais
  4. 394 Million Jews
  5. 376 Million Sikhs
  6. 23 Million Buddhists
  7. 14 Million Traditional Chinese Religions (sorry for not getting specific, statistics on Chinese religions are spotty at best)
  8. 7 Million Hindus
  9. 4.2 Million Muslims
  10. 2.6 Million Christians
EDIT: You don't need to have Religions strictly the same in composition to ones above, just similar. A religion convergent to Bah'ai/Sikh beliefs is fine, mainly because I can't see this happen with a post-Bah'ai PoD. I'd say keep the PoD Post-Islam if nothing else.
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