The Islamic State (IS) did not originate from barbaric communities or prehistoric peoples. In fact, instead it is a fundamentalist Islamic group stemming from the core of radical Islamic jurisprudence. The organization adheres literally to the fatwas and dogma of radical Islamist scholars, mainly Sheikh Taqi ibn Taymiyyah (1263-1328).
This does not apply only to the IS, but to all fundamentalist Islamic organizations and Salafist jihadists such as al-Qaeda and its branches, the Muslim Brotherhood, Gamaa Islamiya in Egypt and, formerly, the Wahhabi movement in Saudi Arabia. All these movements based their beliefs on the radical dogma of Ibn Taymiyyah.