
As per the Pew Research survey, the United States and Kenya have the highest number of people who converted to Islam from their birth religion.

Muslim population: Islam is the fastest growing religion on the planet, and several studies have predicted that Muslim population with surge by 70 percent and breach the 3 billion mark by the year 2060. Now, a new report by the Pew Research Center, has revealed stunning figures about the changing demographics across the world.
Islam has high retention rate
According to the Pew Research study, Islam has the highest retention rate among major world religions, with very few leaving their birth religion or are still associated with it in some manner. The survey, conducted in 13 countries, found that the number of adults who were born Muslims, but do not identify with the religion anymore, is very low, compared to other religions like Christianity, Judaism, and Hinduism.
The study revealed that among the small number who have left Islam, are either no longer associated with any religion, identifying as atheists or agnostics, or have converted to Christianity, another Abrahamic faith.
Which faith lost most followers to Islam?
As per the Pew Research survey, the United States and Kenya have the highest number of people who converted to Islam from their birth religion. As many as 20 percent of American Muslims, and 11 percent of Kenyan Muslims, said they were raised in another religion or did not follow any faith before accepting Islam.
Notably, Muslims are a minority in both countries, with about 1% of US and 11% of Kenyan adults, currently identifying themselves as Muslims, the Washington-based think tank noted, that the majority of those who converted to Islam were raised as Christians.
Did religious conversion result in major demographic changes?
According to the survey, less than 3 percent of adults left of converted to Islam in these 13 countries, a clear indication that religious conversion posed no threat to religious demography of these regions.
In Indonesia, the number of adults who were raised as Muslims, and those who identify as ones, is the exact same at 93 percent, means there is no significant difference between the number of people who converted to Islam from another religion and those who were born into a Muslim family.
Less than 1% of all adults surveyed in Indonesia said they had left or entered Islam, the report stated.
What percentage of people grew up in a Muslim family?
As per data revealed in the study, most people raised as Muslims, still identify with Islam in their adulthood, and barring the US, the survey does not show a significant difference in the number of people who converted to Islam.
According to the data, even in the US, where Islam has the lowest retention rate, about three-quarters of people who grew up in a Muslim home, still consider themselves as Muslims.
In rest of the countries surveyed in the study, over 90% of people raised in Muslim families, identified as Muslims in adulthood.
Which religion has most ex-Muslims?
The analysis revealed that 13 percent of adults in the US who were raised as Muslims no longer follow any religion, while around 6 percent of those who left Islam now identify as Christians.
Similarly, in Kenya and Ghana, 8 percent and 6 percent, of ex-Muslims are now followers of Christianity.
According to the report, most adults who identify as Muslims, were raised in Islam, which includes Muslims surveyed in Bangladesh, India, Indonesia, Israel, Tunisia and Turkey.
What is the situation on Hindus
The study noted that sufficient data about demographic changes in Hinduism could only be obtained from four countries — India, Bangladesh, Sri Lanka, and the United States.
Based on this data, the study found that there have been no major changes in Hindu population, with almost every adult in India and Bangladesh, who was raised as a Hindu, still identifying as one, while in Sri Lanka, around nine out of ten people who grew up as Hindus have retained their identity.
In the US, about eight out of ten people raised in Hinduism, identify themselves as Hindus in adulthood.
How many people left Hinduism?
Of the four countries surveyed, the highest share of people who were raised as Hindus but no longer identify as one, were found in the United States (18%) and Sri Lanka (11%).
In Sri Lanka, most people who left Hinduism now identify as Christians, while in the US, 11% of people who grew up in a Hindu household are now religiously unaffiliated, and identify as atheists or agnostics.