I have been involved in a few conversations about Gnosticism lately and it's prompted me to ask, what can Christians learn from Gnostics? I ask this because, while I do see Gnosticism as a counterfeit form of Christianity, I nevertheless think there are opportunities to learn from it. I think this of every religion.
With Gnosticism this can be a bit tricky though. Because often things are attributed exclusively to Gnostic scriptures which are already found within the New Testament. For example, authoritative females (Acts 18:26) and mystical experience (Acts 22:17).
But, as have been said by others, alternative spiritualities are often the unpaid bills of the church. What unpaid bills does Gnosticism reveal? What can we learn from the Gnostic revival?