Peter Berger is one of the major sociologists of our day. A Lutheran Christian of the ELCA variety, he discusses the explosion of Christianity in still-Communist China, a phenomenon described in that country as “Christianity fever”:
The most reliable source for religious demography is the World Christian Database, headed by Todd Johnson, which has been counting Christian noses worldwide for many years now. Johnson and his associates claim that there were about one million Christians in China in 1970 (a sharp decline from earlier in the twentieth century because of Communist repression), and that there about 120 million today, with some 70 million in unregistered churches. Representing over 9% of the total population of 1.3 billion, this estimate, if correct, would constitute one of the most spectacular explosions in religious history. The WCD people further estimate that, if present trends continue (always an iffy assumption, of course) the Christian population in China will reach 220 million by 2050. This would be a considerably higher proportion of the total population, because of the demographic consequences of the one-child policy. . . .