There's a lot of historical and social context with Gnosticism that gets lost when you just read the remaining writings. When the Romans spread into the Middle East, they brought back home a lot of new ideas and beliefs. Romans were pretty accepting of almost all belief systems. As long as you worshipped the Roman dieties, or later the Emperor, then you could spend the rest of your religious life doing whatever you want. Anyway, so the returning Roman soldiers brought Eastern mystery religions back to the Mediterranean.
These can be pretty varied, but the actual beliefs of the mystery cult is less important than the structure. You start a secret society with rich or influential people. You get people to buy-in, usually literally. Then you promote members who show the most loyalty, give the most money, or bring in the most new members. As people get promoted, they get benefits. These benefits can be wealth, social standing, sexual favors, or access to secret knowledge, and many times they were a combination of all of these things. They were really just religious pyramid schemes that rewarded more senior members at the expense of newer members.
Notable is that the true beliefs of the cult were hidden in the secret knowledge, and this information was only accessible to the highest ranking members. But the "true beliefs" and "secret knowledge" weren't the point of the cult. They were just benefits that motivated the newer and lower standing members to buy-in even more. We see mystery cults based on Middle East and Asian mythology, mystery cults based on Greek or Roman dieties, or mystery cults based on really anything. When the mystery cults based themselves in Christianity, they were called Gnostics.
So don't think the Gnostics were trying to broadcast a more fully fleshed Christology or theology. They didn't make these writings and beliefs known to just anyone. It took a lot of commitment, money, work, and time to get to the point where you could even learn what was in these writings. By that point, the writings and true knowledge was inconsequential. By the time you learned that the secret knowledge was all nonsense, you were in so deep and benefitting so much that you just went with it. As someone already mentioned, the various Gnostic cults usually had contradictory beliefs with each other as well. So it's not like they tapped some unknown source of truth that normal Christians could access.
Now I'm not saying that there aren't interesting ideas in Gnostic writings, but that's all they are. The earliest Christians fought the Gnostics constantly. The Gospel and writings of the Apostles were preached and freely distributed. The Church taught that all people were equal, and special privileges were denied. They also taught that money, social standing, and sex were all beside the point and usually detrimental to the true faith. So these early Christians wrote treatises against the Gnostics and freely distributed them to anyone that wanted them. The earliest canonical Bibles were created as a defense against Gnostics. At every step, the Christians repeatedly said "they aren't us" and "that's not what we believe"
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