ReligionCompare

Religion Demographics Quiz

How well do you know the numbers behind world religions? Test your knowledge of populations, growth trends, and geographic distribution.

How scoring works

Each of the 15 questions has one correct answer worth one point. Your result is the share of questions you answered correctly, and every question shows an explanation with its source once you answer it.

What the result means

A high score means you know the facts these questions cover. A low score points to the profiles and glossary terms worth reading next. Your answers stay in your browser and are not sent to the site.

Traditions in this quiz

What the 15 questions cover
  1. Which is the largest religion in the world by number of adherents?
  2. Which religion is projected to grow the fastest in the 21st century?
  3. Approximately what percentage of the world's population is religiously unaffiliated ("nones")?
  4. Which country has the largest Muslim population in the world?
  5. Approximately how many Sikhs are there worldwide?
  6. In which region of the world is Christianity growing fastest?
  7. Which European country has the highest percentage of non-religious people?
  8. How many Jews are there worldwide?
  9. What percentage of India's population is Hindu?
  10. The "nones" (religiously unaffiliated) in the United States have grown from about 6% in 1991 to approximately what percentage today?
  11. Approximately how many Buddhists are there worldwide?
  12. Which country has the largest number of Catholics?
  13. How many active Jehovah's Witnesses are there worldwide?
  14. In how many countries can apostasy (leaving Islam) carry the death penalty?
  15. What is the estimated number of Zoroastrians worldwide?

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Question 1 of 15
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Which is the largest religion in the world by number of adherents?

Sources & Further Reading

  1. Pew Research Center, religion reports and datasets.https://www.pewresearch.org/religion/
  2. CIA World Factbook, country-level demographic data.https://www.cia.gov/the-world-factbook/
  3. World Religion Database, global religion estimates.worldreligiondatabase.org (publisher site)