Erin Vearncombe, Brandon Scott, and Hal Taussig, After Jesus: Before Christianity: A Historical Exploration of the First Two Centuries of Jesus Movements (New York: HarperOne, 2021), 226:
By designating the writings found at Nag Hammadi as Gnostic, these writings were also considered to be “bad,” erroneous, because Gnostic was oppositional to Christian. The writings would just be examples of error, heresy, of false forms of Christianity. We know, though, that Gnosticism is not an adequate category for the analysis of early Anointed movements. Setting aside the Gnostic name allows us to see that these writings really resist any easy categorization, easy naming or definition. All the Nag Hammadi writings have in common, at their core, is that they were found in the same jar in the Egyptian desert.