No. The book of Genesis was written by Moses inspired by the Holy Spirit during a period of approximately 1450 to 1410 B.C.
No it wasn’t.
Look into Jewish history instead of Christian History.
The stories in Genesis start long before Moses. History suggests that the first writing of Genesis (or what would become part of Genesis was 700BC-ish. Moses certainly knew the stories and likely taught them, as generations of Hebrews before him had.
I do believe the Bible is the Word of God, written to transcend all levels of knowledge, culture and language. But the story of creation had a very early audience. Simplicity, symbolism and parable was a logical teaching tool (in my opinion). Had God tried to explain gravity to Hebrews in 10,000 BC, he may have lost his audience early.