Gnostics believe occulted knowledge, yes? The means to acquire that knowledge are various.
Once you step down that route, you walk into a world of many paths.
God has laid out one path for salvation. Anything else is one of the paths that leads to destruction.
I get that you think that the Bible is false, but, I don't. I've found it to be the most clear representation of what has been and what will be. I also suspect that, in an odd twist, you and I would agree on more stuff than you might suspect.
Oh, heck, I don't really know where I'm going with this.