If the Popes believed that their God intended to keep them in control of Jerusalem, or indeed, in such high esteem at home, then they were to be rudely disabused. Central to Islam is the notion that the entire world not under its control is Dar al-Harb.
(This is the second chapter of the book World War Three.)
The Qu’ran or Koran is the codification of messages believed by Muslims to have been received by Mohammed from the Angel Gabriel. It says a territory may exist under two conditions: Dar al-Islam and Dar al-Harb. These mean, roughly, ‘Land of Submission’. and ‘Land of War’.