Test your knowledge with our short, 10-question quiz. Questions are based on findings from two Pew Research Center demographic reports: The Global Religious Landscape and Global Christianity. The quiz is not intended to test knowledge of Christian beliefs and practices.

Some of the questions are fairly difficult and the correct answers may surprise you. When you finish the quiz, explore the full reports — then take the quiz again to see how much you’ve learned!

Question 1 of 10

How many Christians are there in the world today?

Question 2 of 10

What share of all Christians around the world are Catholics?

Question 3 of 10

Which country has more Catholics?

Question 4 of 10

Which country has more Protestants?

Question 5 of 10

Which country has more Orthodox Christians?

Question 6 of 10

In 2010, if you lined up everyone in the world by age, the middle person (median) would have been 28. What was the median age of Christians?

Question 7 of 10

What proportion of the world’s total population is Christian today?

Question 8 of 10

What proportion of the world’s total population was Christian 100 years ago?

Question 9 of 10

What proportion of the world’s Christians live in Europe today?

Question 10 of 10

What proportion of the world’s Christians lived in Europe a century ago?