Not familiar with Gnosticism, what’s it generally about?
Gnosticism holds that the Yahweh of the Old Testament is actually an evil god called Demiurge...and that the original God is some super unknowable beings...
The Demiurge created the physical plane and imprisoned mankind in it...as in Gnosticism...all forms of matter is evil
From there...the serpent is the liberator of man by giving man the fruit from the Tree of Knowledge...
Jesus is also another liberator...and actually...Jesus is Lucifer as he is called the Bright Morning Star...
There are multiple Lucifer archetypes...there's Jesus, there's Prometheus, there's the fallen angel Lucifer, there's Odin...
The Lucifer archetype is about enlightenment being given to man from a God...
Lucifer is simply a title. It isn't a formal name unless you talking about the angel.
And the angel Lucifer and Satan are two different beings that have been merged together due to Christians getting their angels mixed up and creating a bad guy...
Satan is the angel that Yahweh uses tempt humans into sinning and is the angel that holds humanity accountable...basically he's a Narc...
Lucifer is the fallen angel...