“But the hour is coming, and now is, when the true worshipers will worship the Father in spirit and truth, for such the Father seeks to worship him. God is spirit, and those who worship him must worship in spirit and truth.” (John 4:23-24)

I want the truth, the whole truth and nothing but the truth …. 

You owe it to yourself to learn all about Christ’s life and teaching and what the Church believes. The goal is exposure to the entire content of the faith—not just a few things sprinkled willy-nilly. It ultimately boils down to truth, and truth matters!

The Catholic Online School RCIA program is carefully designed to provide you with a systematic, comprehensive education in the divine faith of the Church. The goal is to make you “of the truth” by exposing you to the voice of Christ.

In this second section of the program, we explore “The Celebration of the Christian Mystery.”

In this section, we learn about the second pillar of the faith as it’s presented in the Catechism of the Catholic Church. Here are some of the topics you’ll learn about:

  •  The liturgy of the Church and the holy sacrifice of the Mass
  • The sacraments of initiation and the sacraments at service to communion
  • Christian funerals
  • Sacramentals, blessings, and popular devotions
  • Major and minor exorcisms
  • The Holy Rosary


From all of us at Catholic Online School: May Christ bless you on your journey of faith.

“The Celebration of the Christian Mystery" is broken up into 5 different chapters. 

In this course, students will work through Chapter 1.

Students will cover - 

  •  Course 1 - The Liturgy of the Church


Earning a certificate of completion in this online course is not a substitute for completing a parish-based RCIA program. The Sacraments of Initiation can only be conferred by a bishop or priest. This certificate means you have successfully completed a course of study that is intended to supplement your parish RCIA program.


For free. For everyone. Forever.

With God, you can learn anything

Course curriculum

  • 01

    Introduction - RCIA - For Adults - The Celebration of the Christian Mystery - Chapter 1 with 'Certificate of Completion'

    • How to get your 'Certificate of Completion'

  • 02

    The Celebration of the Christian Mystery - Course 1 - The Liturgy of the Church - Lesson 1 - The Liturgy as Source of Life

    • INTRODUCTION - The Liturgy of the Church - Lesson 1 - The Liturgy as Source of Life

    • LESSON PLAN / STUDY GUIDE - The Liturgy of the Church - Lesson 1 - The Liturgy as Source of Life

    • OPENING PRAYER - The Liturgy of the Church - Lesson 1 - The Liturgy as Source of Life

    • SCRIPTURE READING - The Liturgy of the Church - Lesson 1 - The Liturgy as Source of Life

    • VIDEO - The Liturgy of the Church - Lesson 1 - The Liturgy as Source of Life

    • DISCUSSION QUESTIONS - The Liturgy of the Church - Lesson 1 - The Liturgy as Source of Life

    • CLOSING PRAYER - The Liturgy of the Church - Lesson 1 - The Liturgy as Source of Life

    • CATECHISM TEXT, RESOURCES, AND GLOSSARY - The Liturgy of the Church - Lesson 1 - The Liturgy as Source of Life

    • QUIZ - The Liturgy of the Church - Lesson 1 - The Liturgy as Source of Life

    • ADDITIONAL SCRIPTURE READINGS - The Liturgy of the Church - Lesson 1 - The Liturgy as Source of Life

    • Resources for Students, Parents, and Teachers

  • 03

    The Celebration of the Christian Mystery - Course 1 - The Liturgy of the Church - Lesson 2 - A Journey Through the Holy Sacrifice of the Mass

    • INTRODUCTION - The Liturgy of the Church - Lesson 2 - A Journey Through the Holy Sacrifice of the Mass

    • LESSON PLAN / STUDY GUIDE - The Liturgy of the Church - Lesson 2 - A Journey Through the Holy Sacrifice of the Mass

    • OPENING PRAYER - The Liturgy of the Church - Lesson 2 - A Journey Through the Holy Sacrifice of the Mass

    • SCRIPTURE READING - The Liturgy of the Church - Lesson 2 - A Journey Through the Holy Sacrifice of the Mass

    • VIDEO - The Liturgy of the Church - Lesson 2 - A Journey Through the Holy Sacrifice of the Mass

    • DISCUSSION QUESTIONS - The Liturgy of the Church - Lesson 2 - A Journey Through the Holy Sacrifice of the Mass

    • CLOSING PRAYER - The Liturgy of the Church - Lesson 2 - A Journey Through the Holy Sacrifice of the Mass

    • CATECHISM TEXT, RESOURCES, AND GLOSSARY - The Liturgy of the Church - Lesson 2 - A Journey Through the Holy Sacrifice of the Mass

    • QUIZ - The Liturgy of the Church - Lesson 2 - A Journey Through the Holy Sacrifice of the Mass

    • ADDITIONAL SCRIPTURE READINGS - The Liturgy of the Church - Lesson 2 - A Journey Through the Holy Sacrifice of the Mass

    • Resources for Students, Parents, and Teachers

  • 04

    The Celebration of the Christian Mystery - Course 1 - The Liturgy of the Church - Lesson 3 - Why are Catholics Obligated to Attend the Holy Sacrifice of the Mass?

    • INTRODUCTION - The Liturgy of the Church - Lesson 3 - Why are Catholics Obligated to Attend the Holy Sacrifice of the Mass?

    • LESSON PLAN / STUDY GUIDE - The Liturgy of the Church - Lesson 3 - Why are Catholics Obligated to Attend the Holy Sacrifice of the Mass?

    • OPENING PRAYER - The Liturgy of the Church - Lesson 3 - Why are Catholics Obligated to Attend the Holy Sacrifice of the Mass?

    • SCRIPTURE READING - The Liturgy of the Church - Lesson 3 - Why are Catholics Obligated to Attend the Holy Sacrifice of the Mass?

    • VIDEO - The Liturgy of the Church - Lesson 3 - Why are Catholics Obligated to Attend the Holy Sacrifice of the Mass?

    • DISCUSSION QUESTIONS - The Liturgy of the Church - Lesson 3 - Why are Catholics Obligated to Attend the Holy Sacrifice of the Mass?

    • CLOSING PRAYER - The Liturgy of the Church - Lesson 3 - Why are Catholics Obligated to Attend the Holy Sacrifice of the Mass?

    • CATECHISM TEXT, RESOURCES, AND GLOSSARY - The Liturgy of the Church - Lesson 3 - Why are Catholics Obligated to Attend the Holy Sacrifice of the Mass?

    • QUIZ - The Liturgy of the Church - Lesson 3 - Why are Catholics Obligated to Attend the Holy Sacrifice of the Mass?

    • ADDITIONAL SCRIPTURE READINGS - The Liturgy of the Church - Lesson 3 - Why are Catholics Obligated to Attend the Holy Sacrifice of the Mass?

    • Resources for Students, Parents, and Teachers

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Instructor(s)

Instructor Bio:

Deacon Frederick Bartels is a member of the Catholic clergy who serves the Church in the diocese of Pueblo, CO. He received an MA in Theology and Educational Ministry from Catholic Distance University, where he is currently employed as an adjunct professor of theology. He is founder and editor of Joy In Truth (joyintruth.com), an online magazine dedicated to the New Evangelization. As a Catholic educator, public speaker and evangelist, Deacon Bartels strives to infuse culture with the saving principles of the gospel. He lives in Colorado with his wife, Shelly, and the youngest two of their six children. Professor Bartels is Chairman of the Theology Department.

Deacon Frederick Bartels

Professor of Theology, Department Chair