The battle in places like Europe is not between Islam and Christianity (that battle is over, as Christianity as a force has almost disappeared in Europe), but
between Islam and Secular Humanism/Socialism. Adherents of the latter 'religion' haven't yet realized who their real enemy is.
Jude Dougherty has a good essay making your same point in Modern Age Quarterly. Unfortunatly it is not availible on the web. ISI's link makes the point that he "assesses Islam as a "heresy" in the spirit of Hilaire Belloc."
It is the fall 2002 issue.