See big picture: Who is who in Christainity

God is LightBy 2050, Protestantism is projected to rise to slightly more than half of the world’s total Christian population.
There are more than 900 million Protestants worldwide, among approximately 2.4 billion Christians. In 2010, a total of more than 800 million included 300 million in Sub-Saharan Africa, 260 million in the Americas, 140 million in Asia-Pacific region, 100 million in Europe and 2 million in Middle East-North Africa. Protestants account for nearly forty percent of Christians worldwide and more than one tenth of the total human population. Various estimates put the percentage of Protestants in relation to the total number of world’s Christians at 33%, 36%, 36.7%, and 40%, while in relation to the world’s population at 11.6% and 13%.
In European countries which were most profoundly influenced by the Reformation, Protestantism still remains the most practiced religion. These include the Nordic countries and the United Kingdom. In other historical Protestant strongholds such as Germany, the Netherlands, Switzerland, Latvia, Estonia and Hungary, it remains one of the most popular religions.
Changes in worldwide Protestantism over the last century have been significant. Since 1900, Protestantism has spread rapidly in Africa, Asia, Oceania and Latin America. That caused Protestantism to be called a primarily non-Western religion.
By 2010, 59% of Anglicans were found in Africa. China is home to world’s largest Protestant minority.
Protestantism is growing in Africa, Asia, Latin America, and Oceania, while remaining stable or declining in Anglo America and Europe, with some exceptions such as France, where it was legally eradicated but now is claimed to be stable in number or even growing slightly. According to some, Russia is another country to see Protestant growth.
In 2010, the largest Protestant denominational families were historically Pentecostal denominations (10.8%), Anglican (10.6%), Lutheran (9.7%), Baptist (9%), United and uniting churches (unions of different denominations) (7.2%), Presbyterian or Reformed (7%), Methodist (3.4%), Adventist (2.7%), Congregationalist (0.5%), Brethren (0.5%), The Salvation Army (0.3%) and Moravian (0.1%). Other denominations accounted for 38.2% of Protestants.
United States is home to approximately 20% of Protestants. According to a 2012 study, Protestant share of U.S. population dropped to 48%, thus ending its status as religion of the majority for the first time. The decline is attributed mainly to the dropping membership of the Mainline Protestant churches, while Evangelical Protestant and Black churches are relatively stable or continue to grow.

According to Scientific Elite: Nobel Laureates in the United State, a review of American Nobel prizes winners awarded between 1901 and 1972 by Harriet Zuckerman, 72% of American Nobel Prize Laureates came from Protestant backgrounds. Overall, Protestants have won a total of 84.2% of all the American Nobel Prizes in Chemistry, 60% in Medicine, 58.6% in Physics, between 1901 and 1972.

(above quoted from wikipedia. Read more: https://en.wikipedia.org/wiki/Protestantism_by_country )

The following is quoted from: http://christianity.about.com/od/denominations/p/christiantoday.htm
Number of Christians Worldwide:
Christianity is ranked the largest religion in the world today. According to the Pew Forum on Religion and Public Life, in 2010 there were 2.18 billion Christians around the world, nearly a third of the global population.

US adherents – 247 million in 2010 (out of population: 318.9 million (2014))
UK adherents – 45 million in 2010 (out of population: 64.1 million (2013)
Percentage of Christians Worldwide:
32% of the world’s population is considered to be Christian.
Top 3 Largest National Christian Populations:
US – 246,780,000 (79.5% of the Population)
Brazil – 175,770,000 (90.2% of the Population)
Mexico – 107,780,000 (95% of the Population)

SOME FOOD FOR THOUGHT ABOUT UK CHRISTIANITY

The following is from : http://www.bbc.com/news/magazine-27111146 (23 April 2014)

In the 2011 census 59% of residents of England and Wales described themselves as Christian when asked “What is your religion?” This was down from 72% in 2001. In Scotland, the figure was 54%, down from 65%. In Northern Ireland 83% said they belonged to a Christian denomination.

IN 2014, David Cameron’s remarks that the UK is a “Christian country” were criticised by a group of public figures. Writing for the Church Times, the prime minister said British people should “be more confident about our status as a Christian country”.

In response, 50 prominent individuals including authors, broadcasters, comedians and scientists added their names to a letter to the Daily Telegraph which argued the UK was a largely “non-religious society”.

Two senior Conservative ministers have backed the prime minister, arguing that those who deny the UK is a Christian country are “deluding themselves”.