When a new religion supplants an old religion, the gods of the old often survive as the demons of the new. - Cyrus Herzl Gordon

Only two people in East Mediterranean antiquity developed [parallel tendecies towards] "canonical" Scripture: the Greeks and the Jews. The Greeks treated Homer as their Scripture par excellence, much as the Jews regarded the Bible. ...Hebrew and pagan Greek scriptures were each considered the divinely inspired guide for life.

That both the Gilgamesh Epic and the Odyssey deal with the episodic wanderings of a hero, would not be sufficiently specific to establish a genuine relation between them. But when both epics begin with the declaration that the hero gained experience from his wide wanderings, and end with his homecoming, a relationship dimly appears. ...when we note that whole episodes are in essential agreement, we are on firmer ground. For instance, both Gilgamesh and Odysseus reject a goddess's proposal for marriage; and each of the heroes interviews his dead companion in Hades.

Heroic epic and saga (Indic as well as Greek and Hebrew, etc.) combine action with genealogy. This is necessary because the action is performed by aristocrats who require genealogies.