Thomas L. Friedman
Publisher: Farrar Straus & Giroux (2008)

Not content to cleanse its own country of the least degree of religious freedom, the Saudi Government set out to evangelize the Islamic world, using the billions of riyals at its disposal through the religious tax -zakat - to construct hundreds of mosques and colleges and thousands of religious schools around the globe, staffed Wahhabi Imams and teachers.  Eventually, Saudi Arabia, which constitutes only 1 percent of the world Muslim populations, would support 90 percent of the expenses of the entire faith, overriding other traditions of Islam.