People today mistakenly believe that the word Gnostic refers only to a few groups that were active in the Middle East almost two thousand years ago, and left behind the so-called gnostic gospels or gnostic scriptures. In reality, those groups were not isolated or unique. They were part of a worldwide tradition found on every continent, whose roots are not in the physical world at all. 

In fact, Jesus, the greatest gnostic of all and the inspiration for the so-called gnostic scriptures and the modern Christian tradition, is a master of Kabbalah and Judaism. He is a master of Egyptian, Indian, and Tibetan teachings. That is why we find so much of them in his teachings. Therefore, the so-called “gnostic” and Christian scriptures are not separate from those other traditions. All of these teachings are rooted in the same source, so it is a mistake to try to isolate one from another. That only leads to confusion and misunderstandings.

https://glorian.org/connect/blog/what-is-the-gnostic-church