BEIJING, CHINA - OCTOBER 12:(CHINA OUT):Chinese Christians sing during a prayer service at an underground independent Protestant Church on October 12, 2014 in Beijing, China. China, an officially atheist country, places a number of restrictions on Christians and allows legal practice of the faith only at state-approved churches. The policy has driven an increasing number of Christians and Christian converts 'underground' to secret congregations in private homes and other venues. While the size of the religious community is difficult to measure, studies estimate there more than 65 million Christians inside China with studies supporting the possibility it could become the most Christian nation in the world within a decade.  (Photo by Kevin Frayer/Getty Images)