Antignostic

pertaining to knowledge.
possessing knowledge, especially esoteric knowledge of spiritual matters.
(initial capital letter) pertaining to or characteristic of the Gnostics.
(initial capital letter) a member of any of certain sects among the early Christians who claimed to have superior knowledge of spiritual matters, and explained the world as created by powers or agencies arising as emanations from the Godhead.
Historical Examples

The interpretation of this confession was fixed in certain ground features, that is, in an antignostic sense.
History of Dogma, Volume 2 (of 7) Adolph Harnack

We might without loss give up the half of the Apologies in return for the preservation of Justin’s chief antignostic work.
History of Dogma, Volume 2 (of 7) Adolph Harnack

adjective
of, relating to, or possessing knowledge, esp esoteric spiritual knowledge
noun
an adherent of Gnosticism
adjective
of or relating to Gnostics or to Gnosticism
adj.

“relating to knowledge,” 1650s, from Greek gnostikos “knowing, able to discern,” from gnostos “known, perceived, understood,” from gignoskein “to learn, to come to know” (see know).
n.

1580s, “believer in a mystical religious doctrine of spiritual knowledge,” from Late Latin Gnosticus, from Late Greek Gnostikos, noun use of adj. gnostikos “knowing, able to discern,” from gnostos “knowable,” from gignoskein “to learn, to come to know” (see know). Applied to various early Christian sects that claimed direct personal knowledge beyond the Gospel or the Church hierarchy.