Interesting. Apparently, some members of ISIS recognize that Islam is up to its neck in idolatry. Devout Muslims bow down to the Kaaba five times per day, and when they take the pilgrimage to Mecca, they try to kiss the Black Stone. These practices are sheer paganism, but they are essential to Islam. ISIS wants to make some changes.
APA–Representatives of the Islamic State in Iraq and the Levant (ISIS) stated that they will ruin the Kaaba after capturing Saudi Arabia.
APA reports quoting Turkish media that ISIS wants to take control of Arar city of Saudi Arabia and start operations here.
ISIS member Abu Turab Al Mugaddasi said that they would destroy the Kaaba in Mecca: “If Allah wills, we will kill those who worship stones in Mecca and destroy the Kaaba. People go to Mecca to touch the stones, not for Allah.” (Source)
Go to Answering Muslims for more, including David Wood's video dealing with "Islam's idolatrous obsession with the Kaaba and the Black Stone."