The movie 300 has no direct connection to any Bible story. It's more rooted in ancient Greek history and legends, rather than religious texts like the Bible.
Copyrighting such a story involves demonstrating that your work has originality. It could mean adding new twists, interpretations, or creative details. Check with your local copyright authorities for exact requirements and the process to secure the copyright.
The 'Poisonwood Bible' is purely fictional. The author crafted the story and characters from their creative mind rather than drawing from real-life events.