List of the top 10 countries by the largest number of christians.
1. United States
Approximately 20% of the population the of United States are protestant christians. USA has about 160 million protestant christians which is largest number of christian in the world. The first populated christian country in the world.
The african state of Nigeria is the second populated christian country in the world. Nigeria has about 60 million protestant christians which is the largest number in Africa.
Brazil is the third christian populated country in the world. Brazil has approximately 42 million protestant christians
The world's most populated country has approximately 40 million protestant christians. China is the fourth christian populated country in the world.