The Gnostic bibles were left out of Christianity.
They are quite interesting,
They believe not God, but Demiurge created the Universe.
https://en.wikipedia.org/wiki/Gnosticism
It turns out that Reincarnation is promoted.
https://reluctant-messenger.com/reincarnation-gnostic.htm
It actually turns Christianity into something more like Buddhism.
http://gnosis.org/gnintro.htm
Like Buddhism, Gnosticism begins with the fundamental recognition that earthly life is filled with suffering. In order to nourish themselves, all forms of life consume each other, thereby visiting pain, fear, and death upon one another (even herbivorous animals live by destroying the life of plants). In addition, so-called natural catastrophes -- earthquakes, floods, fires, drought, volcanic eruptions -- bring further suffering and death in their wake. Human beings, with their complex physiology and psychology, are aware not only of these painful features of earthly existence. They also suffer from the frequent recognition that they are strangers living in a world that is flawed and absurd.
Not all humans are spiritual (pneumatics) and thus ready for Gnosis and liberation. Some are earthbound and materialistic beings (hyletics), who recognize only the physical reality. Others live largely in their psyche (psychics). Such people usually mistake the Demiurge for the True God and have little or no awareness of the spiritual world beyond matter and mind.
In the course of history, humans progress from materialistic sensate slavery, by way of ethical religiosity, to spiritual freedom and liberating Gnosis. As the scholar G. Quispel wrote: “The world-spirit in exile must go through the Inferno of matter and the Purgatory of morals to arrive at the spiritual Paradise.” This kind of evolution of consciousness was envisioned by the Gnostics, long before the concept of evolution was known.