On the Religion of Magi

Indeed, ArM2 addresses already, just how Hermeticism and the Order of Hermes are connected. I think we had that from catnip & garlic on already.

ArM2 Houses of Hermes p.28 introduces the Seekers and the Legend of the Old Ones. p.30f has a hectoring Arch-Mage with the 'trust-inspiring' name Infamitus expound it. Both thereby put Hermeticism in perspective wrt the history of the Order of Hermes.

((sic!) mine)
The Seekers are magi from the Order of Hermes. They are not among the founders of that Order. By HoH:TL p.15 their early champion is Lucian, first apprentice of Trianoma, who contemplated to form an own line of Bonisagi after 836, and was told off by Notatus.
Hermeticists are quite likely among the Seekers, and campaigns where a discovery by a Seeker converts the Order of Hermes to Hermeticism are certainly possible.

Cheers