Islam has been mentioned for centuries in Christianity. But is Islam a religion or a sect? Addressing the way in which the Catholic Faith has viewed Islam from Vatican Council II onwards, this book outlines the teachings of the Catholic Church about Islam starting with Lumen Gentium, Ecclesiam Suam and Nostra Aetate, followed by the writings of various Popes on the subject including those of Saint John Paul II, Pope Benedict XVI and Pope Francis. It also presents the teachings found in The Catechism of the Catholic Church about the relationship between Catholics and Muslims, as well as the true meaning of the famous saying "Outside the Church There is No Salvation."