Not just Theistic Satanists worship Serpent Gods and Beings!

Ophites of Paganism

Ophianoi, from ὄφις ophis "snake") were members of a Christian Gnostic sect depicted by Hippolytus of Rome(170–235) in a lost work, the Syntagma ("arrangement").

It is now thought that later accounts of these "Ophites" by Pseudo-Tertullian, Philastrius and Epiphanius of Salamis are all dependent on the lost Syntagma of Hippolytus. It is possible that rather than an actual sectarian name Hippolytus may have invented "Ophite" as a generic term for what he considered heretical speculations concerning the serpent of Genesis or Moses.[1]

Apart from the sources directly dependent on Hippolytus (Pseudo-Tertullian, Philastrius and Epiphanius), Origen and Clement of Alexandria also mention the group. The group is mentioned by Irenaeus in Against Heresies (1:30)

There are more than Theistic Satanists that believe in Serpents and Dragons of Garden of Edin.

Gnostic Texts explains allot of this practice.