Takfirism without any proof comes from Ashar'i and similar deviant groups as ISIS and AQ get their ideology from the MB thinker Sayid Qutubisis are more salafi than AQ. they arent surooris like pro-ikhwani salafi sheikhs of egypt.
do asharis teach usul thalatha by miaw? here is them teaching kids usul thalatha.
isis didnt express the mass takfir of major "salafi" sheikhs.
teaching other "salafi" books