Well according to this source,7% of the population is Buddhist, or about 500 million. I mean most people consider Christianity to be the larest religion and that has 2.2 billion people. And you are claiming that two countries have more Buddhists than that combined. You seem to have just listed the five most populous countries in Asia.
https://en.wikipedia.org/wiki/Buddhism_by_country#By_country
Indonesia, Pakistan and Bangladesh fill out the Asian top 5
https://en.wikipedia.org/wiki/Buddhism_by_country#Ten_countries_with_the_largest_Buddhist_populations
It should be
China 244 million
Thailand 64 million
Japan 45 million
Burma 38 million
Sri Lanka/Vietnam 14 million