http://www.gatestoneinstitute.org/4232/boko-haram-nigeria
The Western influence of British colonialists caused a division among the people of Northern Nigeria, who were once united by Islam. This division saw, on one side, the so-called “civilized” — by Western standards — elite who were used by the British as agents of colonization; and on the other side, the commoners, who vehemently resisted Western influence in the region.
Dissatisfaction with Western influence also led to an emergence of Islamist fundamentalists among people of the Northeastern region of Nigeria.
The reason Mohammed Yusuf founded Boko Haram appears to be that he saw an opportunity to exploit public outrage at government corruption by linking it to Western influence in governance.
What developments might have triggered the emergence of violent Islamist group Boko Haram during the last decade in Nigeria? According to Umar Mamodu[1] — a scholar and key Boko Haram historian — its inception in 2002 resulted from a clash between the moderate Islamic teachings of the prominent Sheikh Jafaar Adam at the Mahammadu Ndimi Mosque in Maiduguri-Borno State in the Northeastern part of Nigeria, and the more militant interpretation of the Qur’an by his disciple, Mohammed Yusuf.[2]
According to Mamodu[3], Yusuf believed in the creation of a new order in which the wretched should inherit the earth, and for his extremist views, was expelled in 2002 from the Ndimi Mosque Committee.[4] Later that year Yusuf built a mosque in the northeast Nigeria to serve as a magnet for primary and secondary school pupils who, in response to his teachings, would abandon Westernized schools in the belief that Western education [Boko] is a sin [Haram]; hence the name Boko Haram.[5]