NANJING, CHINA - DECEMBER 23: (CHINA OUT) The church choir sings and prays during a service to celebrate Christmas at St. Paul's Church on December 23, 2006 in Nanjing of Jiangsu Province, China. Millions of Chinese faithful commemorate the birth of Jesus with the Christmas celebrations becoming increasingly popular among Chinese youth after twenty years of China's economy reform. China officially sanctions five religious groups: Protestant and Catholic Christianity, Islam, Buddhism and Taoism. Chinese are allowed to worship only in state-sanctioned churches and temples, according to state media.