It is widely accepted that present historic Adventism emerged in response to the Adventist-Evangelical discussions that occurred in the spring of 1955 to the fall of 1957. These dialogues were initiated by evangelicals Donald Barnhouse and Walter Martin, who sought clarification on what Adventists believed and took issue with a number of teachings, which at the time were generally thought to characterize Adventist theology. The most significant of these being: semi-arian views on the GodHead; man's sinful nature taken by Christ in His incarnation; an incomplete atonement at the time of Christ's death on the cross; salvation by obedience to the law; and extreme sectarianism. At least one author considers the various streams existed earlier, as some Millerites came from churches holding Arian views, but this event polarized them.