There are a number of countries which officially have >99% Sunni Muslim populations. Mauritania, Western Sahara, Morocco, and Algeria are among these countries. However, since apostasy from Islam is not recognized by law, there is a nonzero population that is counted as Muslim, but are actually Atheist.
By country the highest number of adherents are located in Indonesia. By region Islam is most concentrated in north Africa and the middle east.
Muslim
It depends on how the question is read. The fastest growing religion in India is the Baha'i Faith in terms of percentage increase of adherents. It is younger than two centuries old but already has more than two million adherents in India. The fastest growing religion in India is Islam by sheer number since Muslims are quite a large percentage of India and have a large number of children per family.
There are more adherents to Islam today then at any time in the past.
Islam is the second largest religion in the world, with over 1.9 billion followers worldwide. It is based on the teachings of the Prophet Muhammad and the holy book of Islam is the Quran. Muslims practice the Five Pillars of Islam which include faith, prayer, charity, fasting, and pilgrimage.
Islam is ethnic to an extent. Those who choose to convert to it are recognized as full adherents, whatever their ethnic background.
Islam is concentrated in the Middle East, North Africa, South Asia, and Southeast Asia. Countries with the highest Muslim populations include Indonesia, Pakistan, India, Bangladesh, and Nigeria. Islam is the predominant religion in many of these regions.
Christianity is the largest with roughly 2.1 billion adherents across its various sects. Islam is second with roughly 1.7 billion adherents across its several sects. Judaism is substantially smaller, with roughly 14 million adherents.
islam is the biggest religion on the earthWorld Religions[1][2]Four largest religions Adherents Percentage of world population Further information World population 6.8 billion Figure used by individual articles Christianity2.4 billion 34% Christianity by country Islam 1.62 billion 19% Islam by country Hinduism 1 billion 14% Hinduism by country Non-religious1.12 billion 16% Irreligion by country BuddhismCirca 376 million 7% Buddhism by country Total 6.8 billion 93.5% Wikipedia....Thus Christianity is the largest
Muslims are adherents to Islam. Both Judaism and Islam believe there is only one god.
It is still a minority faith, but with a significant number of adherents.
Judiasm, Christianity, and Islam have the most adherents in the Middle East and therefore their adherents are embroiled in the largest number of conflicts.