Saudi Arabia ranks number one on a new list of the most religious countries in the world.

“A fierce religious identity dominates the Sunni-majority nation, with principles of the Koran, conservative Sunni teachings known as Wahhabism, and strict Islamic Sharia law present in all aspects of life,” according to a just-published survey in U.S. News and World Report.

“Most of the men who carried out the 9/11 attacks came from Saudi Arabia.”

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The religion ranking was determined after surveys were completed by over 21,000 citizens in 80 countries.

“Overly restrictive policies may have given rise to dissident groups like al-Qaida that led the deadly 9/11 terrorist attack on the United States and another in 2003 in capital city Riyadh,” U.S. News said of Saudi Arabia. “Most of the men who carried out the 9/11 attacks came from Saudi Arabia.”

Many of the countries on the 2017 top-10 list are Middle Eastern nations.

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In order, here are the top 10 most religious countries:

  • Saudi Arabia
  • Israel
  • Iran
  • India
  • United Arab Emirates
  • Pakistan
  • Jordan
  • Egypt
  • Oman
  • Turkey

The Muslim-dominated countries among those 10 are Saudi Arabia, Iran, United Arab Emirates, Pakistan, Jordan, Egypt, Oman, and Turkey.

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In Israel, the majority of people are Jewish. In India, Hinduism remains the major religion.

These countries rank anywhere from 22 to 79 on the U.S News list of overall “best countries.”