Every sentence in the Bible is true

1. Sentences that are not propositions
   
2. Sentences that contain false propositions
   
3. Unfalsifiable claims
   

Six day creation
The idea that the Earth and the Universe were created in six days a few thousand years ago is completely unscientific. The age of the universe is calculated as being around 13.8 billion years while Earth is calculated to have formed 4.5 billion years ago. The difference between these two dates is significantly greater than six days. For those biblical literalists who argue for a 7,000 year old earth, there are multiple lines of evidence against a recent creation and—by extension—against a six day creation.

Human evolution
The claim that humans were the result of a special creation event at the end of this six day period is wrong. In fact, the evidence that humans and other animals evolved gradually over a period of some three to four billion years is overwhelming.

A global flood
There is no evidence for a global flood event as described in the Bible. While there is evidence for large floods in regions spanning all over the world, there is nothing to suggest one giant flood engulfed the planet's surface. Many ancient tribes and religions across the globe have flood myths, likely arising from past events. This does not suggest the flood described in the story of Noah actually occurred.

Tower of Babel
There is no linguistic evidence for any of the events included in the Tower of Babel myth.