Final answer:
Early Christian Gnosticism diverged significantly from mainstream Christianity, with Gnostics believing in secret knowledge revealed by Jesus. The question of whether true Gnostics can be considered Christians is complex, as traditional Christian doctrines differ substantially from Gnostic beliefs. The early Christian church included a variety of sects and beliefs, many of which were later deemed heretical.
Step-by-step explanation:
Early Christian Gnosticism represents a varied set of beliefs that diverged from what became mainstream Christianity. As "those who know," Gnostics claimed access to secret knowledge about the divine, often perceived as esoteric or magical. They saw Jesus as a revealer of hidden truths, rather than just a savior through his death and resurrection. This idea differed from orthodox Christianity, which is centered on faith in Jesus' teachings and the significance of his death and resurrection for salvation.
The assertion that true Gnostics are not Christians is a topic of discussion among scholars. From one perspective, their beliefs do not align with essential Christian doctrines such as the nature of God and salvation through Jesus Christ alone. In this view, Gnostics, despite their early influence and self-identification with Christ, would not fit within the boundaries of traditional Christianity.
Meanwhile, historical analysis shows how early Christian sects and groups, including Gnostics, Arians, and Donatists, diverged in practice and belief from what was later determined as orthodox Christianity. These sects were often labeled heretical by the early church fathers due to their divergent views. The diversity within Christianity today reflects the religion's complex history, with a myriad of beliefs and practices existing under the broad umbrella of Christianity.