@Aedes,
Quote:But part of her argument is that the people who do mention them are not credible sources, though.
Fine, and I agree that the idea of a large and unorthodox cult leaving no footprint in recorded history is suspicious. However, her opponents do point out that "Essene" wasn't even a word used by the Essenes (assuming they existed).
Having just been introduced to the Essenes myself I'm not too bothered if they get erased from history - and I can see how they are a somewhat sensationalisticly described cult - and therefore likely to be fictional.
They do share a number of qualities with other cults, and I don't see her point about them venerating celibacy as being incompatible with "go forth and multiply" as damningly valid. For example the Cathars did likewise, justifying that certain parts of holy scripture were influenced by a satanic demiurge. Some scholars suggest that this is because they were influenced by Zoroastrian/Manicheist ideas.
However, as an opening argument "they didn't mention themselves and therefore cannot be the authors" is pretty weak - unless there are other people claiming to be the authors mentioned in the text.