A novel's whole pattern is rarely apparent at the outset of writing, or even at the end; that is when the writer finds out what a novel is about, and the job becomes one of understanding and deepening or sharpening what is already written. That is finding the theme.
Although I believe that scripture is divinely inspired and infallible, I have a hard time going along with the belief that the whole creation process occurred in six twenty-four hour days.
Early on, it's good to develop the ability to write. Learning to write is a useful exercise, even if what you're writing about is not that relevant.