IHT reports:

A recent poll by East China Normal University estimated that 31.4 percent of Chinese 16 or older are religious, putting the number of believers at roughly 400 million.

In recent years, official estimates had placed the number of believers at around 100 million, but the fact that the new survey's results were not only made public but were also reported by the government-controlled Chinese news media suggests that the survey has been given at least some official credence.

To read more:

http://www.iht.com/articles/2007/03/04/news/china.php