The US of A.
Yes, most of them are Christians.
Bulgaria
Poland
Jordan
egypt
Probably either India or the Philippines.
I assume you mean sub-saharan africa- and in that case it would be South Africa (the country).
South Africa has the most Christians. They practice this religion 4 times per week.
The most popular religion in South Africa is Christianity (68% of the country are Christians)
Approximately 65-70% of the population in Brazil identifies as Christian, with Catholicism being the largest denomination followed by various Protestant denominations. The country also has a growing number of Evangelical Christians.
The country with the most Christians on earth, at the present time, is China, estimates are around 60 to 75 million. It is only an estimate because many Christians in China attend "underground" or non-government approved churches.
The United States has about 225,000,000 Christians; making it the country with the most Christians in the world.However this number includes a significant proportion of people who profess Christianity, but do not regularly attend church or practice Christian sacraments.