@Ionus,
accepted that the flood part was/could be far older. why i was skeptical about Gilgamesh being taken from another source, is that Gilgamesh was the king of the earliest known settlement/city - Uruk. So which ever people (most likely the sumerians themselves b4 they started living in cities) wrote the earlier version was not a urbanized lot. Yes the flood myth is common to almost all ancient cultures.
very interesting about the basis of the 7 days. i knew the sumerians introduced the 360 day calendar and also the 360 degrees in a circle, but did not know that the 7 days came from their observation of 7 entities of the solar system. But is that is true, then they have had an even greater influence on the hebrew bible, for much of the bible and even the very history of the jews is based on 7's or a multiple thereof.
that's all i was trying to say - that the bible version of 10 commandments came from the book of Ani ("egyptian book of the dead"). it is entirely possible that the said book itself was taken from another proto-egyptian source, just as you say the Gilgamesh epic was. But even monotheism was not an original concept of the jews - the first known monotheistic religion was Aten-ism - again an egyptian construct.
that could well be true about the concept of paradise - that they had something similar going. none the less the particular concept of Paradiese in its present form comes from the persians. Many parts of the babylonian talmud as well.
So in summary, it cannot be denied that the jews incorporated some religious beliefs of 3 civilizations (sumerian, egyptians, persians) that they came in contact with back to back and never really acknowledged the source and almost got away with passing them as their own original stuff. For example til the scrolls of the Enuma Elish were discovered the possibility of the 6/7 days creation story being a "lifted" one was never contemplated. btw, please read the enuma elish if possible - how marduk made the world.