yeah the older Gospel of B. was where Satan was called Belial, and was talking with the angel of Hades, simply called Hades in the text. Bartholomew also conversed with Satan, to which the Devil told him many things like his origin as greatest angel of heaven.
When I was studying Theistic Luciferianism, I thought this was the best text for accuracy on early Christian demons (Satan's son Salpsan, Simon Magus, and the two Egyptian sorcerors in Exodus were all considered to be chief arch demons in the gospel). I'm no longer a Luciferian, or follow this gospel, but what I like about it is the personality it gives Satan and some of the other demonic entities, whereas the Biblical gospels are so vague and colorless as to the nature of these beings.
It's not a "Gnostic" gospel but could have some Gnostic influence, it probably came about in the first few centuries after Christ, or a bit later.