A Theory of Us

Islam: Statistics


Around 23% of the world's population, or 1.7 billion people, currently believes in Islam. What do Muslims believe and value? The Pew Research Center has taken an introductory look at this question. 

While Pew's research has been carried out in almost 40 countries, it's worth noting that it did not include India, Western Europe, Iran, Saudi Arabia, Yemen, and a number of other countries in the Middle East, Africa, and elsewhere. 

As such, their findings statistically represent the views of, at most, around 1.15 billion of the roughly 1.7 billion Muslims in the world.

If we combine data from the Pew surveys with information about population sizes and the percentage of Muslims within the counties polled, though, it is possible to calculate how many Muslims believe and value as a concrete figure. The results are below.


Sharia law is a set of ethical and legal principles based on what is written in the Quran and the hadith. While sharia covers a diverse range of topics, including marriage, divorce, inheritance, and religious observances, it is most notoriously known for prescribing severe punishments for theft, adultery, and apostasy. 

Favoring sharia law does not necessarily mean desiring all elements of it. For example, some Muslims might want all parts of sharia applied as the legal code within their country, while others might want it to apply only in cases of property or family disputes (but not, for example, in criminal proceedings).


Wide consensus exists on the question of the immorality of unmarried sex and homosexuality. Out of more than a billion Muslims in 36 countries, 88% regard sex outside of marriage as immoral, while 89% regard homosexual sex as immoral. 

The only poll questions on which greater consensus exists among Muslims relates to the belief that there is one god, Allah, and that Muhammad is his prophet (97%) and that angels exist (92%). After that, the next most agreed-upon thing is that homosexuality and unmarried sex are immoral. 

For comparison, research published in 2013 by Pew indicates that 60% of people in the United States, 80% in Canada, 79% in Australia, 76% in Britain, 60% in Brazil, 21% in China, and 16% in Russia think homosexuality should be socially accepted.

The maximum number of wives a male is permitted to have in Islam is four (Muhammad was granted exception by god to have as many wives as he pleased). Though permitted, the Quran says that a man should have more than one wife if he can treat them all fairly and equally. It then proceeds to say that they will not be able to do that, implying that a man should not actually have more than one wife.


The majority of Muslims represented in the survey (68%) think that women should have the right to choose whether they wear the veil or not. A majority (86%) also completely or mostly agree that a wife must always obey her husband.

These responses can be taken as evidence of a conflict or tension embedded in the values of Muslims concerning female autonomy. It is worth emphasizing that these questions were asked of both male and female respondents.



The statistics appearing on this page were based on data published in the following studies by the Pew Research Center: 

The following was also used as a reference:

  • John Esposito and Dalia Mogahed. "Who Speaks for Islam? What a Billion Muslims Really Think." Gallup Press, 2008.

Information concerning the total size of a country's population and the total percentage of Muslims within it was needed to calculate many of the statistics above, and this was taken from the CIA World Factbook (here). In the few cases where the CIA World Factbook gave a range for belief in Islam as a percentage of the total population (e.g. 10-15%), a middle value was used (e.g. 12.5%). 

Note that the percentages don't total to 100% in most of the graphs because it was possible for someone to say they didn't know, to offer a different answer than those that the surveys were prepared for, or to refuse to answer a question. Also note that in some cases administrative error by Pew meant that the data for some countries was lost, and that in other cases particular questions were not asked in Sub-Saharan Africa as a region. More information about the sample sizes and the margins of error can be found in the Pew publications themselves, along with information concerning the methodology employed and difficulties encountered. In the case of the 2013 publication, however, the sample sizes varied by country—anywhere from 551 in Lebanon to 1918 in Bangladesh—with margins of error hovering roughly around ± 5 points for each country. 


When interpreting the numbers on this page, be weary that the fact that a belief or value x exists for a given subset of Muslims does not by itself show that Islam is wholly or even partly responsible for that being the case. For example, the fact that 43% of 1182 million Muslims believe in witchcraft does not necessitate that Islam is part of the causal explanation (any more than the fact that x percentage of Muslims use Facebook necessitates that Islam is part of the reason why). On their own, the statistics on this page say what is the case, not why, and it requires inferential work to come to views around the latter question.

Be also aware that someone might respond to a question with a particular answer not because they genuinely believe it, but because they think that is how they should answer it. For example, a Catholic might answer that they believe the bread and wine in communion literally transform into the flesh and blood of Christ not because they actually believe it does, but because they believe they should believe such things. (And keep in mind that the interviews carried out by Pew would often be conducted in front of one's family members in the family home.) Polls like those carried out by Pew find answers based upon what people report believing, not what they genuinely believe, and the two needn't be the same.

Finally, the statistics on this page were gathered from samples that represent anywhere from 0.9 to 1.2 billion of the world's Muslims (with the value varying by the particular question asked). While this is more than half of the world's Muslims, it is not all of them, and one must recognize that the totality of the views of the others (in Europe, America, India, Iran, Saudi Arabia, and elsewhere) may or may not align with what is set out above.