Some Pre Flood inscriptions were found by Dr. Langdon, at Kish, under the Flood
    deposit.
Pre Flood seals were found by Dr. Schmidt, at Fara, under the Flood layer.
Pre Flood seals were found by Dr. Woolley at Ur.
Thousands of books have been found in the ruins of Kish, Erech, Lagash, Accad, Ur,
    Babylon, Eridu, Nippur, Larsa and Fara, which were written on stone, or clay tablets,
    before the days of Abraham.
The oldest known historical document, written soon after the Flood, was found in 1923
    by Dr. Woolley, at Obeid, near Ur.
The  oldest know Outline of World History, called the 'Weld Prism', written 100 years
    before Abraham, about 2170 B.C. and was found in 1922, at Larsa, by the
    Weld-Blundell Expedition.

Weld Prism

Accad (Genesis 10:10), also called "Sippar", which means "Book Town", was
    excavated by in 1881 by Rassam, and 1894 by Scheil.  60,000 tablets were found,
    among them a whole library of 30,000 tablets.
Hammurabi's Code of Laws, carved in Abraham's day, on a great block of stone, and
    set up originally in Babylon, was found 1902 in Susa, by a French Expedition.
    Hammurabi, king of Babylon, about 2000 B.C., he is commonly identified by
    Assyriologists with "Amraphel" of Genesis 14.
A school room of Abraham's day, in Ur, with 150 exercise tablets in mathematics,
    grammar, history and medicine, was also discovered by Dr. Woolley. 
Thousands of inscriptions were found, pre-dating Moses by a thousand years during
    Napoleon's expedition to Egypt in 1798. A scholar accompanying him. 
    J. G. Wilkinson, an Englishman, went back to live in Thebes between 1821-1833 and
    copied inscriptions.
In 1888 among the ruins of Amarna, about 400 clay tablets were found. They were part
    of the royal archives of Amenhotep III and Amenhotep IV, who reigned about 1400 B.C.
    They were written by various kings in Palestine and Syria to the Pharaohs of Egypt.
In 1905 an alphabetic writing, made about 1800 B.C., 400 years before Moses, was
    found by Petrie, at Serabit in Sinai.
Between 1905-1934 alphabetic writings of the period between Abraham and Moses
    were found in Palestine in the ruins of Shechem, Gezer, Beth-shemesh, Lachish, and
    Hittite.
The Behistun Rock, the key to the ancient Babylonian language, was discovered in
    1835, by Sir Henry Rawlinson.
The Rosetta Stone, the key to the ancient Egyptian language, was discovered in
    1799, by Boussard.
 

Note that places, Ur, Kish, Fara, Nippur, Lagash, Sippar, Larsa, Accad and Susa, where the primeval writings were discovered were all in the Garden of Eden region.

Seals were the earliest form of writing. A seal represented a person's name, identified ownership, served as a signature on letters, contracts, receipts, and various kinds of writings.

So who wrote the "Creation Hymn"? It was used by Moses but written long before, possibly by Abraham, or Noah, or Enoch, or even Adam. How did the writer know what happened before man appeared? Maybe God himself taught the hymn to Adam.  Whatever the case, if God knew from the beginning that He was going to use the Bible as a main instrument in the Redemption of Man, why should it be so difficult to believe that God himself gave to man the revelation of that Word?

Babylonian  Creation Tablets found in the ruins of Babylon, Nippur, Ashur and Nineveh
    show that the Genesis ideas had become quite deeply fixed in the thought of earth's
    earliest inhabitants.
Tablets written in various forms circulating before the time of Abraham and depicting
    Creation were found in the ruins of Babylon, Nineveh, Nippur and Ashur. They are all
    strikingly similar to the "Creation Hymn" of Genesis.
Though the Babylonian and Assyrian Creation stories are all grossly Polytheistic, there
    are so many points of similarity to the Genesis account of Creation. It would seem they
    had a common origin.

Leading anthropologist discovered that among all primitive races there was a belief in
    One Supreme God.
Dr. Stephen Langdon, of Oxford University, found that the earliest Babylonian
    inscriptions verified that man's first religion was a belief in One God, and from that
    there was a rapid decline into Polytheism and Idolatry. These were found in Pre Flood
    layers, at Jemdet Nasr, near Babylon
Sir Flinders Petrie found indications that the Original religion of Egypt was
    Monotheistic.
In 1898 Sayce discovered, on three separate tablets of the time of Hammurabi, in the
    British Museum with the words "Jahwe (Jehovah) is God."

In the beginning man had had one God; and in the Garden of Eden, had lived in rather intimate communion with God. But with sin and banishment, man lost his primeval knowledge of God; and, in groping in his darkness for a solution of the mysteries of existence, he came to worship the powers of Nature which seemed to him to be the sources of life. Sex, because it was the means through which life came, played a very important part in early Babylonian religion. Cuneiform inscriptions have revealed that a large part of their liturgies were descriptions of sex between gods and goddesses, through which, they thought, all things came into being. Then, the Sun and Rain and various forces of nature were deified, because on them depended the life of the world. And Kings became deified, because they had power. Many cities and nations made their founders their chief god. To make their gods more real, they created images to represent them until the images themselves became worshipped as gods.  Thus man took his nosedive from Original Monotheism into the abyss of innumerable polytheistic idolatrous cultures, some of which, in their practices, were unspeakably vile and abominable. Even now there are religions that believe that they can work at being a god or become one when they die.

In 1918 Hall and Thompson, of the British Museum, found indications that Eridu, the
    traditional site of Eden, was a prosperous city and revered as the Original Home of
    Man.
Eridu was the home of "Adapa", the Babylonian Adam.
The Weld Prism claims the first two kings in history reigned at Eridu.
Ur, home of Abraham, was 12 miles from Eridu.
Fara, traditional home of Noah, was 70 miles from Eridu
'Obeid, where the oldest known historical document was found was only 15 miles from
    Eridu
Lagash, where primitive libraries were found was only 60 miles from Eridu.
Nippur, the library center was 100 miles from Eridu.
Erech, Nimrod's city, was 50 miles from Eridu.
Larsa, where Weld Prism was found, 40 miles from Eridu.
Babylon was only 150 miles from Eridu

Eridu is the particular spot which tradition has fixed as the site of the Garden of Eden, it is 12 miles south of Ur.

In 1932, in Tepe Gawra, near Ninevah, the 'Adam and Eve Seal' was found by Dr. E. A.
    Speiser of the University Museum at Pennsylvania. He dated it at about 3500 B.C.  It
    portrays a naked man and woman, walking bent over, as if broken hearted or in
    shame, followed by a serpent.
Old records carved on stone and clay at the very dawn of history are evidence the
    stories of Adam and Eve became deeply fixed in the thought of primitive man.

An ancient Babylonian tablet was found, this tablet portrayed in pictures exactly what
    Genesis says in words. The pictures are of a tree in the center, man on one side,
    woman on the other side plucking a fruit, behind the woman is a serpent whispering to
    her. This is known as the 'Temptation Seal'.

Temptation Seal

Records found by all Barbarous Races, i.e., Persians, Hindu, Greek, Chinese,
    Mongolians, Tibetans, Teutons all show to have traditions of a more civilized state of
    man.