What is "cainites"

The Cainites, or Cainians ( Greek: Καϊνοί Kainoi, Καϊανοί Kaianoi), were a Gnostic and Antinomian sect who were known to venerate Cain as the first victim of the Demiurge, the deity of the Tanakh, who was identified by many groups of Gnostics as evil. The sect following was relatively small. They were mentioned by Tertullian and Irenaeus as existing in the eastern Roman Empire during the 2nd century. One of their purported religious texts was the Gospel of Judas.