In Martin Luther's time, the Bible was only available in Latin--a language very few could read. While he was in hiding (many people wanted to kill him), he translated the Bible into German. This way, the common man would be able to personally read and reflect on God's Word, instead of relying on priests and scholars.
Have your little one "transcribe" the Bible by copying an entire page or just a chapter of the Bible in their own handwriting. Or just have them write one verse. Or, if they don't know how to write (like mine), they can just pretend to write.
To make it more fun, let them use a quill or feather. And let them use a fun color of watered-down poster paint.