Ippy, I thought I'd do a bit of arithmetic on your article's figures, though someone's (Matt's?) comment that the sample size relative to the global population is pretty unrepresentative is worth bearing in mind.
Accoring to the article, 63% of those polled say they are religious, whilst only 11% claim to be convinced atheists. So, on extrapolating that to the circa 7.4 billion global population, a little over 4.55 billion are religious, and 2.85 billion are unbelievers or atheists. Of that 2.85 billion, about 820000000 are atheists (that's about 11% of the world's total population).
The article also says that 61% of the Chinese population - currently running at about 1.4 billion - are 'convinced atheists'. A quick calculation tells us that that means that there are about 855000000 atheists in China.
So, that suggests that there are more atheists in China than there are in the whole world, including China.
Does that sound a valid conclusion to you, ippy?
It certainly seems to suggest that the bulk of atheists live in a single country in the world - a country where atheism was forced upon them from 1948 to the early 1980s.