Are there religious texts that predate the Hebrew Bible and include narratives of Adam and Eve and of the great flood?

Answer 1

No, The first recorded stories of both Adam and Eve AND the Great Flood in one text are in the Hebrew Bible

There are no religious texts that predate the Hebrew Bible as the source for the stories of Adam's and Eve's creation. The Hebrew Bible was thought to have been written around 1200 B.C.E. But it may have been based on earlier writings that haven't been found or that haven't survived.

On the other hand, the flood story is a widespread theme among many cultures, described through the biblical account of Noah's Ark, the Hindu Puranic story of Manu, through Deucalion in Greek mythology and Utnapishtim in the Epic of Gilgamesh.

The earliest extant flood legend is contained in the fragmentary Sumerian Eridu Genesis, datable by its script to the 17th century BCE.[1]

The story tells how the god Enki warns Ziusudra (meaning "he saw life," in reference to the gift of immortality given him by the gods), of the gods' decision to destroy mankind in a flood-the passage describing why the gods have decided this is lost. Enki instructs Ziusudra (also known as Atrahasis) to build a large boat-the text describing the instructions is also lost. After which he is left to repopulate the earth, as in many other flood legends.

After a flood of seven days, Zi-ud-sura makes appropriate sacrifices and prostrations to An (sky-god) and Enlil (chief of the gods), and is given eternal life in Dilmun (the Sumerian Eden) by An and Enlil.

In the Babylonian Epic of Gilgamesh, toward the end of the He who saw the deep version by Sin-liqe-unninni, there are references to the great flood (tablet 11). This was a late addition to the Gilgamesh cycle, largely paraphrased or copied verbatim from the Epic of Atrahasis (see above).

The hero Gilgamesh, seeking immortality, searches out Utnapishtim in Dilmun, a kind of paradise on earth. Utnapishtim tells how Ea (equivalent of the Sumerian Enki) warned him of the gods' plan to destroy all life through a great flood and instructed him to build a vessel in which he could save his family, his friends, and his wealth and cattle. After the Deluge the gods repented their action and made Utnapishtim immortal.