Sorel also perverts the faith of Christianity to make his comparison. To reduce the Christian faith to a "myth that Christ will one day return and usher in the end of time" is an intellectually lazy construct of convenience. If the belief in the second coming of Christ was all Christianity had to offer, I dare say there wouldn't be many Christians in the world.
But the myth is all that socialism has to offer most people. Those who better understand it know that socialism creates a famously wealthy ruling class, so they likely have more realistic, though certainly more selfish, reasons for promoting it.
Glad you like the article. I want to check out the author's book now.