Well the creation story is different though YAH/the Demiurge was the failed creation of Sophia, one of the creations of the real father God (one of his many .. Archons? I forget the term, but in Gnosticism there are many other beings and a whole story before the creation of man).

She created something without the knowledge of aid or help of the all-father, and it ended up being depraved. She hid it on it's own little platform and asked for forgiveness. It was granted, but she had to be on the level near her creation where it was failing to make his own creatures like everyone else made from the father was able to. The others felt bad for Sophia and convinced her creation to breath into what he was trying to make. Therefore man was given a piece of the divine Sophia. The Demiurge got angry and made them forgot and cast them out. Sophia made them eat the fruit to try and save them.

There are variations to the story, but the basics of Gnosticism is that we are being deceived about the true nature of the world. If we could only awaken the secret knowledge, we would be liberated. Most common liberation stories are Gnostic (sometimes be accident, but sometimes very intentional). The Matrix, Plato's Cave, The LEGO Movie .. they all follow that pattern. "Once you know the truth it will set you free."

The trouble with the whole Plato's Cave and its variants .. how do you know you're really out of the cave? What if you just move into a different cave, or are given a different more compelling story, to make you fight against your brothers when really no one knows the truth?