Almost half of the 2.4 billion declared Christians are Catholics. But how much do you know about this faith? Whether it’s curiosity sparked by a conversation, a glimpse at a Mass, or trying to better understand a Catholic friend or family member, many believers want to understand the principles of the Catholic faith. 

As someone who has studied the history of Christianity, I can tell you this: understanding Catholicism is essential if you want a full picture of Christianity. And it can lead to a better knowledge and connection with your faith. 

Catholics believe in one God, existing as Father, Son, and Holy Spirit, and follow the teachings of Jesus Christ. Catholics practice faith through the seven Sacraments, including Baptism and the Eucharist, and honor Mary and the saints. Central practices include attending Mass, prayer, and acts of charity. Keep on reading if you want to better understand the complex (but beautiful) history of Christianity and why Catholicism is such a great part of it, even today.

In this article, we’ll explore the 10 key Catholic beliefs (with thorough explanations), the Biblical and historical foundations of the Church, the role of the early Church Fathers, and how Catholicism rose and evolved into what it is today.