Paul Marshall has a fine, concise explanation of the Islamic grievance against the West. Quoting Osama bin Laden's words he makes clear the motivations and nature of the struggle we find ourselves in. Here are a couple of excerpts:
The network's central grievance, continually expressed, is the collapse of the Islamic world in the face of "Christendom" - a collapse explained by Muslims' apostasy from Islam, and which can be reversed only by returning to their version of Islam.
At the end of 2004, bin Laden lamented the "control exerted by the Zionists and the Cross worshippers" on Muslims, and he described the world conflict as "a struggle between two camps. One camp is headed by America, and it represents the global Kufr (infidelity), accompanied by all apostates. The other camp represents the Islamic Ummah (nation) headed by its Mujahideen Brigades." Similarly, his December 27, 2004 "Letter to the Iraqi People" referred to the war "between the army Of Mohammed, the army of belief, and the people of the cross." He warned Iraqis not to participate in the January 30, 2005 elections since the Iraqi constitution is "a Jahiliyya (pre-Islamic) constitution that is made by man," and Muslims may elect only a leader for whom "Islam is the only source of the rulings and laws."
At the end Marshall asks this question:
How should we respond to this radical, worldwide movement with millions of adherents whose programme it is to unite Muslims worldwide into one people, with one divinely sanctioned leader, governed by a reactionary version of Islamic law, and organized to wage a permanent war on the rest of the world - a war that from its perspective can only end in the annihilation, conquest or conversion of all non-Muslims?
Good question. Read his answer at the link.