When I first became a Christian I set about to read the Bible from beginning to end. Genesis and Exodus was pretty interesting but then Leviticus got a little dry with all the laws and begetting. Then it struck me how detailed these laws were and how long ago Leviticus was written. Supposedly, these people were just a few generations away from cavemen, yet they wrote this about dead animals in Leviticus:

³² When any one of them dies and falls on anything it becomes unclean—any item of wood, clothing, leather, sackcloth, or any implement used for work. It is to be rinsed with water and will remain unclean until evening; then it will be clean. ³³ If any of them falls into any clay pot, everything in it will become unclean; you must break it.

Weren't these the same simpleton's that invented a diety to explain things like thunder, drought or famine? But then were smart enough figure out things like germs?  Technically, germs weren't discovered until the 1600's when Louis Pasteur looked through a new invention called a microscope. These people who lived almost 7000 years ago were smart enough to figure how to avoid diseases like dysentery and typhoid.
"You shall also have a place outside the camp and go out there, and you shall have a spade among your tools, and it shall be that when you sit down outside, you shall dig with it and shall turn to cover up your excrement." -Deuteronomy 23:10-13
One of the first settlements in America nearly died off from dysentery and typhoid in part because of where the people of Jamestown were doing their business. Did theJews figure this stuff out on their own or did they have some help from God? If they figured it out on their own, why then invent a diety?