Gnosticism (jan 1, 80 – jan 1, 300)

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"from 80: development of Gnostic thought"
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"The earliest sources/ witnesses suggest that Gnostic thought originated slowly around the end of the first century within early Christianity. At the turn of the century, it took on the quality of a system; and from the middle of the second century, it expanded explosively into advanced Gnosticism. No evidence exists for a pre- or non-Christian origin of Gnosticism! From the beginning, Gnosticism was a movement of emancipation, which linked itself to various educational traditions, joined them with each other, could separate specific (e.g., Christian) elements again, and represented, from the perspective of the time, a “modern” view."

- Schnelle, Udo . The First One Hundred Years of Christianity (pp. 558-559).

" As Christianity developed and became more popular, so did Gnosticism, with both proto-orthodox Christian and Gnostic Christian groups often existing in the same places. The Gnostic belief was widespread within Christianity until the proto-orthodox Christian communities expelled the group in the second and third centuries (AD). Gnosticism became the first group to be declared heretical." - Wiki

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