I am not familiar with this convert from Judaism, however the following brief clip from the L’Osservatore Romano article has aroused my curiosity. He has written a book titled The Faith of Demons. I am anxious to read the full English translation of the article.
Catholic Culture reports: Satan’s pride and envy, says Hadjadj, make him the “manager of self-sufficiency and the father of utopia” apart from the God’s plan for creation– an attitude that Haddjadj finds in Malthus as well as Marx, an attitude that “despises human freedom as well as divine freedom” and “ignores the reality of concupiscence and of grace.” More is here with Wikipedia link.
