You can find out a lot about this on-line. The Jewish Encylcopedia says: "The fact that Azazel occupied a place in Mandæan, Sabean, and Arabian mythology (see Brandt, "Mandäische Theologie," pp. 197, 198; Norberg's "Onomasticon," p. 31; Reland's "De Religione Mohammedanarum," p. 89; Kamus, s.v. "Azazel" [demon identical with Satan]; Delitzsch, "Zeitsch. f. Kirchl. Wissensch. u. Leben," 1880, p. 182), renders it probable that Azazel was a degraded Babylonian deity. Origen ("Contra Celsum," vi. 43) identifies Azazel with Satan; Pirḳe R. El. (l.c.) with Samael; and the Zohar Aḥare Mot, following Naḥmanides, with the spirit of Esau or heathenism; still, while one of the chief demons in the Cabala, he never attained in the doctrinal system of Judaism a position similar to that of Satan."