According to Operation World, North Korea, Japan, and Mongolia all have Christian populations that are less than 2% of the country population. In contrast, Christians make up over 30% of the population of South Korea. Analyzing the population of the entire region, the non-religious population is the largest group (40%), followed by those that practice Chinese religion and Buddhism.
The map below also highlights the Christian presence in the provinces of China instead of showing a single figure for the entire country. Christianity is more prevalent, as a percent of population, in the east and north. On the other hand, Tibet, also know as the Xizang Autonomous Region, is less than 1% Christian, in the far west of the country. In 2010, Operation World estimated China’s Christian population to be around 105 million, third in the world behind the United States and Brazil, and just above Mexico.