During the last 20 years, the number of Muslims in the world has been increasing steadily. Statistics for the year 1973 indicate that the world population of Muslims was 500 million; now, it has reached 1.5 billion. Today, every fourth person is a Muslim. It is probable that the Muslim population will continue to increase and that Islam will become the world's largest religion.
The reason for this steady rise is not only the increasing population in Muslim countries, but also the growing numbers of people who are turning to Islam, a phenomenon that has gained momentum, especially after the attack on the World Trade Center on September 11, 2001 (hereinafter referred to as 9/11). This attack, deplored by everyone, especially Muslims, has suddenly turned people's attention (especially Americans) to Islam. People in the West are talking a lot about what kind of a religion Islam is, what the Qur'an says, what obligations come with being a Muslim, and how Muslims are required to conduct their affairs. This interest has naturally brought about a rise in the number of people worldwide turning to Islam. So, the commonly heard prediction after 9/11 that "this attack will change the course of world history" has, in a sense, started to come true. The process of returning to religious and spiritual values, which the world has been experiencing for a long time, has become a turning to Islam.
