One of the interesting things here up front is that they say it competes with “Marxism and western culture.” While not so obviously apparent in 1979 when the Soviet Union still existed, it is apparent today that Marxism IS western culture, they are joined. So there really are only two competing ideologies...the socialist west and Islam.
This makes a great short read also!
http://shoebat.com/2011/07/02/what-to-expect-the-effect-of-muslim-population-growth-on-a-society/