Is Islam the most converted religion in the world?
You’ve probably seen this claim on social media or in articles discussing the rapid growth of Islam. But there’s an important question behind it:
Are more people becoming Muslim through conversion, or is Islam growing for other reasons?
The answer may surprise you.
Islam is the world’s fastest-growing major religion according to recent global research. However, being the fastest-growing religion is not the same as having the most converts.
Let’s look at what the research actually shows, and why people from different backgrounds choose to explore Islam.
What Is the Most Converted Religion in the World?
There is no reliable, universally accepted global ranking that identifies one religion as receiving the most converts each year.
Religious conversion is difficult to measure consistently across countries. Some people formally join a religion, others change their beliefs without a formal process, and some leave religious affiliation entirely.
Researchers therefore often use the term religious switching to describe changes between the religion someone was raised in and their current religious identity.
According to Pew Research Center’s 2025 global religious change report, Islam was the fastest-growing major religion between 2010 and 2020.
But its growth was driven primarily by demographic factors rather than conversion.
The key distinction: Islam is the fastest-growing major religion in the available global data, but that does not establish it as the religion with the most converts.
How Fast Is Islam Growing Worldwide?
Pew Research Center’s analysis provides a clearer picture of Islam’s global growth.
| Measure | Finding |
|---|---|
| Muslim population in 2020 | Approximately 2.0 billion |
| Muslim population increase, 2010–2020 | Approximately 347 million |
| Muslim share of the world population in 2020 | 25.6% |
| Global religious ranking by population | Second, after Christianity |
| Fastest-growing major religion, 2010–2020 | Islam |
These figures come from Pew Research Center’s June 2025 analysis.
The Muslim population grew by approximately 21% during the decade, compared with roughly 10% growth for the rest of the world’s population.
Researchers identified two major demographic factors: Muslims were younger on average and had higher fertility rates than other major religious populations.
Conversion remains part of the story, but it does not explain most of the global increase.
How Many People Convert to Islam?
There is no precise worldwide count of people converting to Islam each year.
However, national surveys can reveal important patterns.
In a 2025 Pew Research Center study of religious switching, approximately 20% of Muslim adults in the United States reported that they were raised outside Islam.
Most people who entered Islam in the surveyed countries had previously identified with Christianity.
At the global level, though, switching into and out of Islam has a relatively small effect on the overall Muslim population.
This distinction matters because statistics should help us understand religious change—not simply reinforce a popular headline.
Why Do People Convert to Islam?
People embrace Islam for many different reasons.
Some begin by reading the Quran. Others become interested through friendships, personal reflection, marriage, or questions about God and the purpose of life.
There is no single conversion experience.
Still, several aspects of Islamic belief and practice may be meaningful to people exploring the faith.
1. Belief in One God
At the heart of Islam is Tawhid: belief in the oneness of Allah.
The Quran states:
“Say, He is Allah, [who is] One.” Surah Al-Ikhlas 112:1
For someone exploring religion, the Islamic understanding of one God may provide a clear foundation for thinking about worship, purpose, and accountability.
2. A Personal Connection With the Quran
For some converts, reading a translation of the Quran is an important step in discovering Islam.
The Quran addresses questions about creation, morality, human responsibility, mercy, and the Hereafter.
Many new Muslims begin with an English translation before gradually learning to recognize and recite the original Arabic.
3. Daily Worship and Spiritual Discipline
Islam includes regular acts of worship, such as Salah, fasting during Ramadan, and giving charity.
These practices provide structure for religious life.
For a new Muslim, learning how to pray can be both meaningful and challenging, particularly when Arabic pronunciation and unfamiliar movements are involved.
4. Community and Belonging
Muslim communities bring together people from different cultures and backgrounds through shared worship and religious practices.
Mosques, community gatherings, and friendships can provide support to someone learning about Islam.
However, conversion experiences differ. Some new Muslims find welcoming communities immediately, while others need time and support to build those connections.
5. Questions About Life and Purpose
Some people explore Islam after reflecting on questions such as:
- Why are we here?
- What is our responsibility toward others?
- What happens after death?
- How should faith influence everyday decisions?
Islam offers religious teachings that address these questions through the Quran and the Sunnah.
These are possible motivations, not a statistically ranked list of conversion reasons. Individual experiences vary.
Is Islam Growing Through Conversion in the United States?
The United States provides an interesting example of religious change.
Pew Research Center’s 2025 analysis found that one in five Muslim American adults surveyed had been raised outside Islam.
This indicates that converts form a meaningful part of the Muslim community in the United States.
But the same research also shows that some people raised Muslim no longer identify with Islam as adults.
Understanding both directions of religious switching gives a more accurate picture than focusing only on conversions.
For Muslim communities, these findings also raise an important educational question:
How can new Muslims receive the knowledge and support they need after embracing Islam?
What Should Someone Learn After Converting to Islam?
Becoming Muslim is the beginning of a learning journey, not the end.
New Muslims often have practical questions about prayer, Quran reading, Arabic, and everyday Islamic practices.
A helpful starting point is to focus on a few foundations.
Understanding the Shahada
The Shahada is the declaration of faith affirming that there is no deity worthy of worship except Allah and that Muhammad ﷺ is His Messenger.
Understanding its meaning is central to embracing Islam.
Learning How to Pray
Salah is an essential part of Muslim worship.
Beginners can start by learning purification, the prayer movements, and the recitations needed for prayer, with guidance from knowledgeable teachers.
Beginning Quran Reading
A person does not need to speak Arabic fluently to begin learning the Quran.
Many learners start by listening to short Surahs, studying their meanings in translation, and gradually developing Arabic reading and pronunciation skills.
Building Islamic Knowledge Gradually
Islamic learning is a lifelong process.
New Muslims can benefit from studying the basics of faith, worship, the Prophet Muhammad’s ﷺ life, and Islamic character without feeling pressured to learn everything immediately.
A supportive teacher or knowledgeable community can make that journey easier.
Frequently Asked Questions
Is Islam the fastest-growing religion in the world?
Yes. According to Pew Research Center’s 2025 findings, Islam was the fastest-growing major religion globally between 2010 and 2020.
Is Islam the most converted religion?
There is insufficient comparable global evidence to confidently identify Islam as the religion receiving the most converts. Population growth and conversion are different measures.
Why is Islam growing so quickly?
Research indicates that the main global drivers are the relatively young age structure and higher fertility rates of Muslim populations. Conversion contributes but is not the primary explanation.
How many Muslims are there worldwide?
Pew Research Center estimated approximately 2.0 billion Muslims worldwide in 2020, representing 25.6% of the global population. These are estimates for 2020, published in 2025, not a live population count.
Can someone become Muslim without knowing Arabic?
Yes. Arabic fluency is not a prerequisite for embracing Islam. New Muslims can begin learning the Quran, prayer, and Islamic teachings gradually.
Exploring Islam Is Just the Beginning
Statistics can tell us how religious populations are changing.
But behind every conversion is an individual journey involving questions, learning, and personal decisions.
Whether someone has recently embraced Islam or wants to strengthen their understanding of the faith, access to reliable Islamic education matters.
At IQRA Network, our live, one-on-one Quran, Arabic, and Islamic Studies classes help learners develop their knowledge at a pace suited to their level.
From learning Arabic letters to understanding Islamic beliefs and practicing Quran recitation, meaningful progress begins with a strong foundation.
Explore Quran, Arabic, and Islamic Studies Classes at IQRA Network
