To clarifiy some precepts here that have been mishandled, perverted, and ran around the block after being bred to twenty different other fawlty religions to create some unidentifiable offspring known as THE TRUTH.......
Gnosticism (note capitol G) would be indicative of various religious organizations, Like Christian Gnostic for an example --there are several subsets of those. They tend towards roughly the same precepts as gnosticism (note lowercase g) which is a sort of spiritual philosophy that is not contained to any one faith or religious subset or structure. Not all gnostics are Christian Gnostics, but Christian Gnostics can be reasonably viewed as gnostics. Mani Gnostics would have been much different than todays Gnostics but ...still gnostics. Gnostics tend to be very relaxed about the variants in the order. They have a central origin that is accepted if not abided to by throughout both schisms.
Gnosticism has and does come in many different sorts of flavors. It may either be an organized relgion or simply accepted into one's spiritual path as a philosophy or a belief (gnostic). Nearly all Gnostics and gnostics are well informed about gnostic origins of creation--prime creator, Sophia, Archons, Aeons, and how those are viewed from culture to culture. Today's American Gnostics typically tend less towards Sophia but acknowledge a Mother-Father God.
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gnosticism,(lower case g) the philosophy is typically found in many and varous non Abrahamic based thought or religions with its focus on inner self, personal truth seeking, source knowledge and individualized (as opposed to collective) salvation. Buddhism can be reasonably viewed as gnostic in nature, and so can most earth based (pagan) religions with their focus on inner wisdom and truth seeking.
gnostic paganry Goes very well together and are not in the least bit of opposition.
Christian Gnosticism (like Christianism--christian paganism) is very comfortable for those who like thier Chrisitianity but don't want to be bound to dogma. gnosticism in general is the central thread that runs through most New Age thought, and various non Abrahamic religions through out the world.