The clearest scholarly references to Ultradispensationalism (sometimes known as "Extreme Ultradispensationalism" or "Bullingerism") are made by Charles C. Ryrie and Charles F. Baker. Ultradispensationalism is a niche doctrine of Christian belief that believes that the Christian Church began with Paul’s statement made to the Jewish leaders at Rome near the end of the Book of Acts with Acts 28:28 stating: "Be it known therefore unto you, that the salvation of God is sent unto the Gentiles, and that they will hear it" being the foundational Scripture of belief of the doctrine of Ultradispensationalism.