Like communism, it represents for many of its devoted adherents a transnational ideology tilting toward an eventual utopian vision, in this case of a vast, if not global, caliphate governed according to sharia, the legal code based on the Koran.
A utopian ideal based on the 9th-century Arab Empire (whose day-to-day code of laws shari'a was), and being essentially an enlightened feudal kingdom? I'm skeptical as to how broad its appeal could be in this age. Then again, "dictatorship of the proletariat" didn't exactly sound like a winning proposition either.
Anyway, according to the article, most political Islamists in France are not isolationist radicals, but seek to engage within the existing system, which suggests that political Islam may assimilate into mainstream French politics much as Communism did.