Probably the closest earliest competitor to Christianity was Mithraism. And you can find more info, in the Wiki article Mithras in comparison with other belief systems. I first encountered that from a theology major, when I was taking math, psychology, philosophy, theology and literature courses, at Aurora University. That’s also when I discovered the Theosophical Society resource library in Wheaton, Illinois.
I think it’s fair to say, that different esoteric writers, will develop totally different systems. If it’s true today with folks like Helena Blavatsky, Max Heindel and G. I. Gurdjieff - it will be true with ancient Gnostic teachers and writers. I don’t see them being any different, then these contemporary esoteric philosophers.
I’m intrigued by the ancient Gnostic incorporation of reincarnation and what they saw, as that ultimate goal. And they probably got that understanding from either Pythagoras and similar Greek philosophers. Otherwise, from travels to (or visitors from) the East. And if so and they had written works or public teachings on the subject, I would assume they had the same understanding as folks like Pythagoras, related Greek philosophers or Eastern sources (i.e. Do Gnostics believe in reincarnation?). Unless their public discovered writings, contradicted this understanding. Which I would like to see a statistical presentation:
How many known Gnostic teachers were there?
How many Gnostic teachers presented written presentations, that displayed noticeable differences?
How many taught or implied reincarnation?
Of those teaching reincarnation, how many actually presented contrary written material - contradicting that everyone would reach Gnosis?
Do any of the Gnostic experts here or elsewhere, have any statistical data, to answer the above questions?
I like to try to understand the Gnostics, as they saw themselves. Much like how the controversial writer and PhD anthropologist, Carlos Castaneda, saw the Yaqui “Man of Knowledge”.
That’s why you will find I have spent years, in authentic Native American ceremonies (I.e. Holy Men/Medicine Men/Roman Catholic Black Elk and Fools Crow - are duel spiritual citizens).
Or practicing disciplines like Zen (much like Catholic Trappist writer Thomas Merton).
Or to learn how would it be, to step into their existential, phenomenological field of perception. However, the contemporary Gnostic writers/philosophers are probably far removed from their ancient counterparts. We are limited to looking at the ancient written sources and the scholarly commentary.
Same problem occurs when I try to understand the Holy Fools tradition members - as they saw themselves. Since I don’t have any contemporary role models to emulate, I draw inspiration from:
Murdoch of the A-Team
Curly Howard of the Three Stooges.
And I have to be an exemplar to their tradition, if I’m true to my weekly, Joe Osteen TV message.