If people studied the Islamic religion in full, then no one would be attracted to such a religion.
I don't know the Most popular religion. But the most common ones are; Hinduism, Buddhism and Islamic.
Serfs are Islamic
The Islamic religion
The religion that Muhammad is favored is the Islamic religion. The Islamic religion regards Muhammad as its most important prophet, and pilgrims to sites he visited are important parts of the religion.
Iran
Muslims
Mohammad and Ahlah
Muslims
Most people in the Middle East today practice Islam.
In every country or place you will find people that practice the Islamic religion, as it has widely spread thoughout the world.
Muslim