The roots of modern political Islam can be traced back to the Asharites of the tenth century and Ibn Taymiyyah (born 1263, Ḥarran, Mesopotamia—died Sept. 26, 1328). The Ashari Doctrine and Al-Ghazali shaped Ibn Taymiyyah himself. However, traditional Political Islam started right with Mohammad in the sixth century. From the first day of Islam, Muhammad was political, his wars, his alliances, his establishment of a state; the Quran itself is considered a constitution for many Islamic groups. The Asharites and Al-Ghazali were the link between the prophet Muhammad (the old school of political Islam) and Ibn Taymiyyah (the new school of political Islam). Both schools are identical in doctrine, just used different means to adapt to different circumstances and times.
Ibn Taymiyyah is one of the most rigid theologians of Islam. His impact on present day terrorists is far more forceful than anyone else in the history of Islam. His teachings and views hardened many present-day Radical Muslims to the degree that millions of Radical Muslims want to live the early traditions of Islam with their rigidity and intolerance. More ominous, they want to spread this way of life to every part of the world. Ibn Taymiyyah wanted Islam to return to its origins (the Quran and Sunnah) and nothing else. To him, Modernism even by the standards of his time (13th/14th Centuries) is evil and against the will of Allah and the teachings of Islam.