Books can be attributed to "Anonymous" for several reasons:
* They are officially published under that name * They are traditional stories not attributed to a specific author * They are religious texts not generally attributed to a specific author
Books whose authorship is merely uncertain should be attributed to Unknown.
I would not recommend this translation apart from trying something different. While broadly the project itself is admirable, the literalistic approach and the open desire to translate from already held theological positions make this translation dubious.