It is not only the Shiites who are bound by religious ties seemingly indecipherable to the West. From the chaos that was created with the Islamic schism came a very fluid situation in the development of Sunni Islamic dogma, with the Sunnis embracing a notion of consensus among the historical Muslim community, a line of thinking that led to the creation of four so-called legal schools of Islamic thought (the Maliki, the Hannafi, the Hanbali and the Shafi'i). These schools produced Islamic scholars who in turn competed for a constituency of followers. While in theory Sunni scholars preached adherence to the customs of the prophet Muhammad, in practice the Sunni schools became intertwined in the affairs of state and business. This deviation from the pure practice of faith led to the growth of "mystic societies" known as Sufism. Sufi brotherhoods sprang up throughout the Muslim world, each preaching its own mystical path toward achieving personal growth through the teachings of the prophet Muhammad.

The Abbasid caliphate, which oversaw this period of religious "softening," in which the pure practice of Islam gave way to a more secular tolerance of the baser concerns of man, was centered in Baghdad. It was the fall of Baghdad to the Mongols in 1258 that signaled not only the end of the Abbasid caliph's rule but the certification in the eyes of some Sunni faithful that Abbasid's ruin was brought about by the lack of pure faith in Islam by those professing to be Muslim. One of the basic tenants of the Sunni faith was the notion of community consensus, or "taqlid." Taqlid was actively practiced by three of the four "legal" schools of Sunni thought. The sole exception was the school of the Hanbali, which followed a stricter interpretation of the faith. A Hanbali religious jurist, Ibn Taymiya, rose to prominence in the aftermath of the Mongol invasion. He held not only that the Mongols were an enemy of Islam but that the Shiite Islamic state that emerged in Persia after the Mongol conquest was likewise anathema.

More important, Ibn Taymiya broke ranks with the rest of the Sunni community, especially those who practiced Sufism, declaring all to be an affront to God. Ibn Taymiya rejected the notion of community consensus represented in the taqlid and instead professed that a true Muslim state could exist only where the political leader governed as a partner with the religious leader, and was subordinated to the religious through strict adherence to the "sharia," or religious law. The Muslim jurists, or "ulema," held total sway over society, to the extent that even matters pertaining to war were reserved for the religious leader, or imam, who was the only person authorized to declare a jihad.

During the Abbysid caliph, the term jihad had taken on the connotation of inner struggle. This interpretation gained wide acceptance with the spread of the Sufi brotherhoods, which were all about inner discovery. Ibn Taymiya rejected this notion of jihad, instead proclaiming that true jihad involved a relentless struggle against the enemies of Islam. For a while his teachings were popular, especially when they were being used to encourage the forces of Sunni Islam confronting the infidel Mongol invaders. However, his strict interpretation of Hanbali tenets were rejected even by other Hanbali religious scholars, and Ibn Taymiya himself was branded a heretic.

The teachings of Ibn Taymiya continued to be taught in certain Hanbali circles, including those operating in the holy city of Medina. It was here, in the 18th century, that a Arab Bedouin from the Nejd desert, in what is today Saudi Arabia, named Muhammed al-Wahhab emerged to create a movement that not only embraced the teachings of Ibn Taymiya but took them even further, preaching a virulent form of Islam that claimed to seek to bring the faithful back to the religion as practiced by the prophet Muhammad himself. Wahhab's movement, known as the Call to Unity, reflected his strict interpretation of Islam as set forth in his book Kitab al-Tawhid, or the Book of Unity.

At first Wahhab was rejected by the Sunni scholars, and he was hounded and finally forced to take refuge in the tiny village of Dariya. There Wahhab befriended the local governor, Muhammed Ibn Saud, initiating what was to become a partnership in which the Saud family took on the role of emir, or political leader, while Wahhab became imam, or religious leader. The team of Bedouin warrior and Islamic fanatic soon led to what would become known as the Wahhabi conquest, bringing much of what is now present-day Saudi Arabia under their strict religious rule. In 1802 a Wahhabi army attacked Karbala and sacked the sacred Shiite shrine to Hussein. In 1803 the Wahhabis sacked Mecca, laying waste to the most holy sites in the Islamic world, including the Great Mosque. In 1804 the Wahhabis captured Medina, looted the tomb of the prophet Muhammad and shut off the hajj, or pilgrimage, to all non-Wahhabis. The rise of the Wahhabi empire was seen as a threat to all Islam, and soon a massive counterattack was mounted by the caliphate in Egypt. By 1818 the Wahhabis had been destroyed in battle, and everyone professing Wahhabism was treated as an apostate and butchered. The head of the Saud tribe was captured and beheaded, along with many of his fellow tribesmen.

Deep in the Arab deserts, a small number of Saudi tribesmen, strict adherents to Wahhabism, survived the Egyptian onslaught and began the struggle to regain their lost power. By 1924 the Wahhabis once again controlled Mecca and Medina, and by 1932 a new nation, Saudi Arabia, emerged from the Arabian deserts, governed by the house of Saud and with religious affairs totally in the hands of the Wahhabis.