Gnosticism, associated with figures like Marcion and the Albigensians, is characterized by three core principles: dualism, the divinization of man, and knowledge as redemption. These ideas plague the Church down to the present time.

Gnosticism, associated with figures like Marcion and the Albigensians, is characterized by three core principles: dualism, the divinization of man, and knowledge as redemption. These ideas plague the Church down to the present time.