veracity of estimates published by some sources. For example, Gerda Wielander (2013) has claimed that estimates of the number of Christians in China that have been spread by Western media may have been highly inflated. For instance, according to Asia Harvest, a US non-profit organization and "inter-denominational Christian ministry", there were 105 millions Christians in China in 2011. The compiler of these figures, Paul Hattaway, indicates that his figures are his own estimate, based on more than 2,000 published sources such as Internet reports, journals, and books, as well as interviews with house church leaders. The study points out that "owing to the difficulties of conducting such a [study] in China today – not the least of which is the sheer size of the country – there is [in the study’s rough estimation] a margin of error of 20 percent." Citing one of the aforementioned surveys, Gerda Wielander says that the actual number of Christians is around 30 million. Similarly, missionary researcher Tony Lambert has highlighted that an estimate of "one hundred million Chinese Christians" was already being spread by American Christian media in 1983, and has been further exaggerated, through a chain of misquotations, in the 2000s. Christopher Marsh (2011) too has been critical of these overestimations. On 6 January 2015, David Ferguson published on the People's Daily the satirical news Merry Christmas, 100 million Chinese! criticising such type of journalism. Demographics by province Special administrations Hong Kong Christianity has been practiced in Hong Kong since 1841. As of 2010 there are 843,000 Christians in Hong Kong (11.8% of the total population). Macau As of 2010 approximately 5% of the population of Macau self-identifies as Christian, predominantly Catholic. Catholic missionaries were the first to arrive in Macau. In 1535, Portuguese traders obtained the rights to anchor ships in Macau's harbours and to carry out trading activities, though not the right to stay onshore. Around 1552–1553, they obtained temporary permission to erect storage sheds onshore, in order to dry out goods drenched by sea water; they soon built rudimentary stone houses around the area now called Nam Van. In 1576, Pope Gregory XIII established the Roman Catholic Diocese of Macau. In 1583, the Portuguese in Macau were permitted to form a Senate to handle various issues concerning their social and economic affairs under strict supervision of the Chinese authority, but there was no transfer of sovereignty. Macau prospered as a