During the early 19th and late 20th century, modernism slowly entered the church and the modernists wanted to reform it. But it was easily defeated by Pope St. Pius X when he restored the Tridentine Mass to its original form and spread catechism to every church and school. The modernist clergy cannot do anything but return to tradition. Until a modernist pope, Pope John XXIII opens the Second Vatican Council. And made many reforms until his successor, Pope Paul VI, executed most of its plans, including the reform of the Holy Mass, known as the Novus Ordo Mass. This event divided the Catholics, which are The Modernists and the Traditionalists. Today, these two types of Catholics are having a battle of words including social media. In this article, we will discuss these two Catholics, their beliefs, and their attitudes. We will also share how we approach them and give advice to these two.