The Mandaeans are the world's oldest continuously existing Gnostic sect, and we're talking about them in depth with Dr. James McGrath of Butler University.

Literature:
Lynn Picknett, Clive Prince - The Templar Revelation: Secret Guardians of the True Identity of Christ
Lynn Picknett, Clive Prince - The Masks of Christ: Behind the Lies and Cover-ups About the Life of Jesus
Jorunn Jacobsen Buckley - The Mandaeans: Ancient Texts and Modern People
Andrew Philip Smith - John the Baptist and the Last Gnostics: The Secret History of the Mandaeans
G.R.S. Mead - Gnostic John the Baptizer: Selections from the Mandaean John-Book
E.S. Drower - Secret Adam: A Study of Nasoraean Gnosis https://archive.org/details/DrowerE.S.TheSecretAdam.AStudyOfNasoraeanGnosis

Allfather Odin - https://archive.org/details/AllfatherOdin.EncountersWithAGod
Heretic Jesus - https://archive.org/details/jesuswasausurperandjohnthebaptistwasthetruechrist.ahereticalcompilation_201906
Gnostic Archons - https://archive.org/details/Archons.HiddenRulersThroughTheAges
Occult Psychopathy - https://archive.org/details/KnightJadczykLauraOrganicPortals.TheOccultReasonForPsychopathy