Exploring Mythic Tropes

To what degree must a sacred text be unique in order to be holy?

Image of Gilgamesh looking giant and muscled and a lion in his arms looking tiny and scared
Image of Gilgamesh overpowering a lion in one hand, with a harpe (a ceremonial royal weapon with a curved blade) in the other. This limestone relief stood at the entrance to the throne room of Sargon II, king of Assyria, at Khorsabad (Iraq), c.725 BCE.