Westkirk believes that the historic and foundational tenets of orthodox Christianity are non-negotiable. These beliefs are called major doctrines or essentials. A major doctrine, "is one that has a significant impact on our thinking about other doctrines, or that has a significant impact on how we live the Christian life" (Grudem, Wayne. Systematic Theology: an introduction to Biblical Doctrine, Grand Rapids: Zondervan Publishing House, 1994), p. 29. The major doctrines that we hold to be undeniably true are:
