The attempt to articulate the boundaries of Christian identity in the third century involved inner-Church debates between groups which held different views on what constituted Christianity. The Church had been engaged in a long struggle against the gnostic view of God, and that of Marcion. The former separated the highest God from the Creator God of the Old Testament, and the latter separated the Creator God of the Old Testament from the redeeming God of Jesus. Noetus' central doctrine was based on an argument which combined Scripture and Stoic logic. The dynamic monarchian doctrine was condemned for denying the deity of Christ. Christian identity concerned discipline as well as doctrine. Tertullian's views on discipline are focused in his teachings concerning post baptismal sins, asceticism, and martyrdom. Origen's Christian discipline was as strict as that of Tertullian, at least prior to the latter's adoption of Montanism. The Novatian schism raised the question of the nature of the Church.