I was at one time inclined to lean more towards Gnosticism, found out I was not smart enough to understand all of the concepts, and disagreed with their stance on an evil Creator being at fault for mankind's woes. Gnosticism really interested me, but I could not get around the fact that they believed in more than one God, an evil Creator of the Old Testament and the Perfect Creator that sent Jesus Christ to reveal the unknown.
It's not quite that black and white.
Gnostics did indeed believe in one almighty God, but this God is spread across a vast Pleroma (fullness) of God composed of the Monad itself, but also various emanations (these can be though of as aspects) such as divine Wisdom, Mind, Forethought, Word etc. It's easier to understand this concept than the orthodox Trinity IMO, but it is similar. Valentinians counted 30 such emanations.
The Demiurge, who is usually considered the "evil God", is the manifestation of Ignorance, he could also be thought of as False Wisdom. He was the product of Sophia (Wisdom) emanating independantly of the rest of the fullness of God (Pleroma).
But, he could still be considered part of the Pleroma, and in fact some Gnostics such as the Basilideans worshipped a combination God of the Father/Mother (Monad) and the Demiurge in a form called Abrasax.
The Demiuge in several Gnostic systems was not evil, but mearly ignorant and foolish, unaware of the Pleroma above him, one of his epithets being Samael which means "Blind God".
At his birth he was imbued with a portion of his mothers power. He created the world as best he could and included his mothers power in its construction giving it life, but because he was flawed he created the world flawed, so we have death and suffering.
Christ being part of the Pleroma called the Logos (Word/Reason) of God and the partner of Sophia, descended to the world of the Demiurge to reclaim the lost power of Sophia trapped in the world by the unwitting Demiurge. He did this by teaching Gnosis, knowledge of the Pleroma, to humans - the beings in which most of Sophia's power had become trapped and that we now call Spirit. On reaching Gnosis the Spirit is released and returns to the Pleroma. If Gnosis is not reached the Spirit is reincarnated.
Some texts even have the Demiurge reaching Gnosis at the end of the world, and returning in full to the Pleroma.