Raziel: Angel of Secrets, Agent of Magic
Sefer Raziel HaMalakh was supposedly taught by the angel Raziel to Adam HaRishon. At least that's what I remember from reading its introduction. Kol tuv
[Angel with a fiery sword - or is it Herzl? - detail from Die Bucher Der Bibel, illustrated by E. M. Lilien]
This is a great thought. While Raziel is not generally portrayed as a cherub or as the guardian to Eden, this incident of an angel arming humanity with a book of power to help them cope after the expulsion would be a logical inspiration for the orphaned legend we've been discussing.
As I explained in my earlier entry on the tzohar, Tzohar: Gem of Noah, Light of Heaven, Raziel ("Secret of God") provided a book, some say inscribed on sapphire, to the primodial couple (Zohar I:55a). The magical manual Sefer Raziel ha-Malach claims this as its origins.
In other sources more securely within Jewish tradition, Raziel bears the words of mortals to heaven and, hearing what is said from behind the celestial curtain, brings decrees back to earth (Targum Kohelet 10:20). In other sources, Raziel stands between other angels, shielding them from the fiery breath of the Hayyot who uphold God's throne (Beit ha-Midrash 1:58-61). He is at times identified with the angel Galitzur (Malachei Elyon, p. 180). In the Zoharic literature, Raziel seems to personify the sefirot of Tiferet (Zohar Hadash 99:3).
To learn more consult the: Encyclopedia of Jewish Myth, Magic, and Mysticism: http://www.amazon.com/Encyclopedia-Jewish-Myth-Magic-Mysticism/dp/0738709050