Two have dared to declare that Islam is at war.
French (Socialist) Prime Minister Declares "France Is At War With Terrorism, With Jihadism, and With Radical Islam"
Harper: "The International Jihadist Movement Has Declared War"
George Friedman at Stratfor has some good thoughts in A War Between Two Worlds:
The (post-war) matter was complicated by the fact that Europe was no longer simply Christian. Christianity had lost its hegemonic control over European culture over the previous centuries and had been joined, if not replaced, by a new doctrine of secularism. Secularism drew a radical distinction between public and private life, in which religion, in any traditional sense, was relegated to the private sphere with no hold over public life. There are many charms in secularism, in particular the freedom to believe what you will in private. But secularism also poses a public problem. There are those whose beliefs are so different from others' beliefs that finding common ground in the public space is impossible. And then there are those for whom the very distinction between private and public is either meaningless or unacceptable. The complex contrivances of secularism have their charm, but not everyone is charmed.
Read the whole thing. He does not really address Islam's wars not just against the West, but elsewhere too. He makes the point that "multicultural secularism is the heir to Christianity in the West."