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 Islaam 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 Islaam, a phenomenon that has gained momentum, especially after the attack on the World Trade Centre on September 11, 2001 (hereinafter referred to as 9/11).