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"Guénonian Traditionalism has been one of the main influences on Sufism in the West. It was established by René Guénon, a French philosopher who at one point worked within the context of the Catholic Institute in Paris, but in 1930 left Paris for Cairo where he died some twenty years later, cited as a model of Muslim and Sufi piety by no less an authority than Abd al-Halim Mahmud, then rector of the Azhar and so the preeminent religious authority in Sunni Islam. Mahmud, however, had not read Guénon's books, and failed to appreciate the true nature of Guénon's Traditionalism.
This derived ultimately from Perennialism, a religious and philosophical school established in Florence during the Renaissance. Renaissance Perennialism held that all the world's religions were expressions of a single original "perennial" religion, since lost to humanity. This hypothetical "perennial" religion is the "tradition" referred to in the title "Traditionalism."
Guénon's Traditionalism, however, was more than a revival of an old and by then somewhat discredited theory. He added to it a conviction that European civilization was in terminal decline" (...)
FONTE:
http://www.aucegypt.edu/faculty/sedgwick/trad/write/WSuf.htm
(Vestlig sufisme og traditionalisme)