One of the earliest and most potent threats to early Christianity came from the heretical group known as the Gnostics. Blending elements of Christianity, Greek philosophy, and oriental mysticism, the Gnostics denied the orthodox view of God, man, and the world, and Christ. The apostle John included them in the camp of the Antichrist.

The Gnostics were so called because of their view of revelation. The word gnosis is the Greek word for "knowledge." In many cases the Gnostic heretics did not make a frontal assault against the apostles or against the apostolic teaching of Scripture. In fact, many of them insisted that they were genuine, Bible-believing Christians. It wasn't that they rejected the Bible; they just claimed an additional source of knowledge or insight that was superior to or at…