To add to what Cofty said, there are a few more things that opened my eyes. I read a few essays by Thomas Paine. They are really good. He was one of the Founding Fathers of the United States.
He pointed out the spinning sword in the Garden of Eden story is a blatant anachronism. It is a bronze age tool in a stone age story. It would be like writing a story about Christopher Columbus and having him answer his cell phone while sailing on the Santa Maria.
Reread the story of Babel. It actually is quite short. Gen 11:1-9. It is written from the perspective of a person who believes the earth is flat, and that's just the beginning of the problems with the story.
Actually Gen chapters 1 - 11 or so is enough to put the book down and never pick it up again. Flood? Take a look at ancient Chinese History and tell me civilization had a divine reboot 4000 years ago. Yeah right.