Flip the demographics of the 10 most practiced religions.

What else could one flip, by the way? Languages maybe?

There is a good list here - Languages by total number of speakers.
For this to be flipped, you need to achieve:

1,09 billion Italian speakers
983 million Vietnamese speakers
544 million Turkish speakers
527 million Yue Chinese/Cantonese speakers
422 million Marathi speakers
281 million Tamil speakers
etc.

down to 66 million Mandarin Chinese speakers
Huh, interesting. That'd actually quite an interesting world. I guess the Italians rule the world and waves, especially if it is spoken more than modern English. Which is basically relegated to England at this point.
 
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