The Kindle (and probably all e-book readers) is best for reading a book straight through. It’s not as great for jumping around and trying to find specific locations in a large book.
Some Bibles have a direct verse jump feature which allows you to jump to a verse by typing in a few abbreviated book titles and chapter and verse numbers. Osnova has many Christian works and at least one Catholic Bible (DR) in this format.
osnova.com/
The Kindle is also great for downloading lots of articles from the web and reading them later when you are away from the computer. I just convert them to plain text Unicode (UTF-8) documents and save them directly on my Kindle.