From an art history and materials perspective, this is totally forged. The iconography is post enlightenment (Baphomet and occult symbology can be traced back to French and Italian occultists that designed the modern forms) they didn't exist in that form 2,000 years ago.
The Gold paint on the pages is not like anything you would see from medieval or antique gilding, which would sit very flat on the page. It looks like it was painted, sloppily, with a modern gold medium. The pages are uniformly stained and frayed at the edges, not natural aging.
If this was done in antiquity they would have never let an artist this bad work with such expensive materials.