According to the surveys, five countries tie for the title of most religious. In each of Ethiopia, Malawi, Niger, Sri Lanka and Yemen, 99 per cent of those questioned answered "yes". A further four - Burundi, Djibouti, Mauritania and Somalia - saw 98 per cent reply in the affirmative.
A temple in Luang Prabang, Laos
The 20 most religious countries
1. Ethiopia - 99% feel religious
2. Malawi - 99%
3. Niger - 99%
4. Sri Lanka - 99%
5. Yemen - 99%
6. Burundi - 98%
7. Djibouti - 98%
8. Mauritania - 98%
9. Somalia - 98%
10. Afghanistan - 97%
11. Comoros - 97%
12. Egypt - 97%
13. Guinea - 97%
14. Laos - 97%
15. Myanmar - 97%
16. Cambodia - 96%
17. Cameroon - 96%
18. Jordan - 96%
19. Senegal - 96%
20. Chad - 95% (six other countries - Ghana, Mali, Qatar, Republic of the Congo, Rwanda and Zambia - also returned a result of 95%)
As the map demonstrates, the most religious regions are Africa and the Middle East, with south-east Asia and Latin America not far behind. Faith is important to many southern European countries too, with 74 per cent of Italians and 71 per cent of Greek claiming to feel religious.
A chapel in Lefkada, Greece
Poland stands out against the rest of Europe, with 86 per cent answering "yes" to the poll; Paraguay would appear to be South America's most religious country.
Around three in 10 Britons feel religious, it suggests, compared to 56 per cent of Americans.
The vast majority of Chinese do not feel religious, according to the polls
The least religious countries, on the other hand, include Japan, Estonia, Sweden, Norway and the Czech Republic, but China surpasses them all, with only seven per cent.
The 20 least religious countries
1. China - 7% feel religious
2. Japan - 13%
3. Estonia - 16%
4. Sweden - 19%
5. Norway - 21%
6. Czech Republic - 23%
7. Hong Kong - 26%
8. Netherlands - 26%
9. Israel - 30%
10. United Kingdom - 30%
11. New Zealand - 33%
12. Australia - 34%
13. Azerbaijan - 34%
14. Belarus - 34%
15. Cuba - 34%
16. Germany - 34%
17. Vietnam - 34%
18. Spain - 37%
19. Switzerland - 38%
20. Albania - 39% (three other countries - Austria, Hungary and Luxembourg - also returned a result of 39%)
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