Asians as % of world, and Asian Christianity

A friend writes, “I’m in Indonesia this week with [redacted]. I am told that 2 of every 3 people in the world are Asians. That’s 4.9 billion people. Do you have any idea how many, Or what percentage, are not Christians?”
The question is “fairly” simply answered from Joshua Project’s data. It does involve some processing of affinity blocks and the like. Since it’s probably of interest to others as well, I reproduce my answer below:

 JP AB Code  Affinity Bloc Name  Population  Christians %
A001 Arab World      373,430,400        22,364,163 5.99%
A002 East Asian Peoples   1,555,386,700      131,525,775 8.46%
A003 Eurasian Peoples      811,089,420      585,230,514 72.15%
A004 Horn of Africa Peoples      125,167,400        63,058,339 50.38%
A005 Persian-Median      174,590,100             507,190 0.29%
A006 Jews        15,274,780             378,075 2.48%
A007 Latin-Caribbean Americans      659,921,450      603,943,265 91.52%
A008 Malay Peoples      406,985,050      142,085,533 34.91%
A009 North American Peoples      238,500,080      194,943,197 81.74%
A010 Pacific Islanders        14,103,800        12,753,900 90.43%
A011 Southeast Asian Peoples      230,131,750        13,245,793 5.76%
A012 South Asian Peoples   1,678,175,780        24,696,164 1.47%
A013 Sub-Saharan Peoples      821,666,930      482,559,497 58.73%
A014 Tibetan-Himalayan Peoples        99,107,390        12,351,263 12.46%
A015 Turkic Peoples      176,859,000          1,587,593 0.90%
A016 Unclassified               14,400                    398 2.76%
TOTAL   7,380,404,430   2,291,230,659 31.04%
ASIANS   5,132,325,190      911,229,825 17.75%

“Asian” is a little problematic, but for this exercise I am adding up East Asian, Eurasian, Persian, Malay, SE Asian, S Asian, Tibetan, and Turkic. I suspect the difference between my total of 5.1 billion and my friend’s estimate of 4.9 billion has to do with including Eurasians. But the numbers are close enough.
The answer to “What % are non-Christians” is simply 100-17.75, or 82.25%.
Interestingly, what it reveals is that Asians make up 70% of the world, but less than half of the world’s Christians – in fact, the difference between Asian Christianity and total global Christianity is a bit more than the total US population.