Understand why Christians worship the way they do
A rigorous, two-thousand-year panorama of liturgy, music, architecture, and sacramental practice — tracing the theological decisions and historical forces that shaped every major Christian tradition, from the New Testament house church to the global Church today.

"The way a community prays is never theologically innocent — and once you learn to read worship as a theological document, you can never hear a liturgy the same way again."
— Theoria

What you'll learn
What you'll be able to do
- Trace the development of Christian worship from New Testament house churches through contemporary global traditions, identifying the key theological and historical turning points at each stage.
- Analyze the distinctive liturgical practices of major Christian traditions — Eastern Orthodox, Roman Catholic, Anglican, Lutheran, Reformed, Methodist, Baptist, and Pentecostal — and articulate the theological convictions behind each.
- Apply the principle of lex orandi, lex credendi to evaluate how a community's worship both reflects and shapes its doctrinal beliefs.
- Interpret primary historical sources — early church orders, patristic writings, Reformation-era liturgies, and hymn texts — alongside modern liturgical scholarship.
- Assess contemporary worship practices with historical and theological awareness, recognizing patterns of continuity, rupture, and cultural adaptation across the centuries.
- Explain how Christian worship has functioned as a means of communal formation, doctrinal teaching, and identity across two millennia of Church history.
How it works
A school that adapts to you
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The curriculum
What's inside your school
6 modules · 29 lessons

Foundations: Worship in the New Testament Church
Examines the origins of Christian worship in Jewish practice and the earliest apostolic communities, establishing the foundational patterns that shaped all subsequent tradition.
- 1.1Roots in the Synagogue and TempleIncluded
- 1.2House Churches and the Shape of Apostolic WorshipIncluded
- 1.3Baptism and the Lord's Supper in the New TestamentIncluded
- 1.4Hymns, Prayer, and the Word in Early Christian GatheringsIncluded
- 1.5Lex Orandi, Lex Credendi: How Worship Shapes BeliefIncluded
The Early Church and the Patristic Era (100–600 AD)
Traces the gradual crystallization of Christian liturgy under Roman persecution and then imperial favor, from early church orders through the great patristic liturgies.
- 2.1Worship Under Persecution: The Pre-Constantinian ChurchIncluded
- 2.2Early Church Orders: The Didache, Justin Martyr, and HippolytusIncluded
- 2.3Constantine, the Basilica, and the Transformation of Christian SpaceIncluded
- 2.4The Great Liturgies of the Patristic AgeIncluded
- 2.5Creeds, Baptismal Catechesis, and the Liturgical YearIncluded
Medieval and Byzantine Worship (600–1500)
Explores the rich flowering of liturgical life in both the Latin West and the Greek East, examining the theology and art of worship in its most elaborate pre-Reformation forms.
- 3.1The Byzantine Liturgical TraditionIncluded
- 3.2The Mass in the Medieval Latin WestIncluded
- 3.3Monastic Worship: The Divine Office and the Rule of BenedictIncluded
- 3.4Sacred Music from Gregorian Chant to Gothic PolyphonyIncluded
- 3.5Icons, Cathedrals, and the Theology of Sacred SpaceIncluded
Reformation and Counter-Reformation: Worship Divided and Reformed (1500–1700)
Examines the radical reshaping of Christian worship across the sixteenth and seventeenth centuries as Luther, Calvin, Zwingli, the Radicals, Cranmer, and the Council of Trent each charted a different liturgical path.
- 4.1Luther and the Lutheran Reformation of WorshipIncluded
- 4.2Reformed and Zwinglian Worship: Word, Simplicity, and the Regulative PrincipleIncluded
- 4.3Cranmer and the Anglican Settlement: The Book of Common PrayerIncluded
- 4.4The Radical Reformation: Anabaptist and Free Church WorshipIncluded
- 4.5The Catholic Counter-Reformation and the Council of TrentIncluded
Revivalism, Denominationalism, and Global Expansion (1700–1900)
Traces how the evangelical revivals, new denominational movements, and global missionary expansion produced new worship forms while debating the relationship between tradition, spontaneity, and culture.
- 5.1The Wesleys, Methodism, and the Power of Congregational HymnodyIncluded
- 5.2The Great Awakenings and Revival Worship in AmericaIncluded
- 5.3Baptist and Congregationalist Free Church WorshipIncluded
- 5.4Missionary Expansion and the Contextualization of WorshipIncluded
Modern Worship: Pentecostalism, Liturgical Renewal, and the Contemporary Church (1900–Present)
Brings the story of Christian worship into the twentieth and twenty-first centuries, examining Pentecostalism, ecumenical liturgical renewal, the worship wars, and the global diversity of contemporary practice.
- 6.1The Pentecostal and Charismatic MovementsIncluded
- 6.2The Liturgical Renewal Movement and Vatican IIIncluded
- 6.3Contemporary Evangelical and Megachurch WorshipIncluded
- 6.4Global Christianity and the Diversification of WorshipIncluded
- 6.5Tradition, Innovation, and the Future of Christian WorshipIncluded
Who it's for
Is this you?
The Parish Pastor
He leads worship every Sunday but wants the historical and theological depth to make more intentional, well-reasoned decisions about how his congregation gathers.
The Seminary Student
He is building a rigorous academic foundation in liturgical theology and Church history to prepare for ministry and further graduate study.
The Lifelong Lay Learner
She has attended church for decades and wants to finally understand the deep historical and theological roots behind the practices she has always taken for granted.
The Ecumenically Curious Christian
He grew up in one tradition but has worshipped in several others and wants a scholarly framework for understanding what divides and unites them liturgically.
The Worship Leader
She plans and leads congregational worship and wants historical depth and theological precision to ground her creative and pastoral decisions.
The Church Historian
He is a serious independent scholar of Christian history who wants a structured, primary-source-grounded curriculum to fill in the liturgical dimension of his knowledge.
Questions
Frequently asked
Your teacher
A note from your teacher

Theoria
If you have ever sat in a worship service — any worship service — and found yourself wondering why it is shaped the way it is, you already have the instinct that drives this school. Why does this congregation recite a creed and that one never does? Why does the Lord's Supper happen weekly in some churches and quarterly in others? Why do some Christians face east to pray, and why does the architecture of a Gothic cathedral make you feel something that a modern auditorium does not? These are not merely aesthetic questions. They are theological and historical ones, and they have answers — rich, layered, fascinating answers that stretch across twenty centuries of the Church's life.
I have spent years studying and teaching the history of Christian worship, and the conviction that drives this curriculum is simple: Christians who understand how the Church has prayed across history are better equipped to pray, to lead, to teach, and to think. The principle lex orandi, lex credendi — the law of prayer is the law of belief — is not an academic slogan. It is a profound observation about the way communities are formed. What we do in worship shapes what we believe, often more powerfully than what we say we believe. That insight alone is worth a semester of careful study.
What you will find here is not a survey that skims the surface. We move carefully through the New Testament roots of Christian worship, through the patristic era's great liturgical documents and their remarkable sophistication, through the Byzantine East and the medieval Latin West, through the upheavals of the Reformation — Luther, Zwingli, Cranmer, the Anabaptists — through the Methodist revivals and the Great Awakenings, and into the modern landscape of Pentecostalism, the Second Vatican Council's liturgical reform, and the contemporary evangelical moment. Every major tradition is treated with seriousness and respect. I am not here to tell you which form of worship is correct. I am here to help you understand each tradition deeply enough to see the beauty and the logic within it.
I want to be honest about what this school asks of you. It asks for slow, attentive reading. It asks you to sit with primary sources — ancient church orders, Reformation-era liturgies, patristic homilies — and let them speak before you rush to evaluate them. It asks you to hold your own tradition with a certain scholarly openness, willing to be surprised, challenged, and enriched by what others have done. If you are willing to bring that kind of attention, I think you will find this one of the most rewarding intellectual and spiritual journeys you have taken.
Whether you are a pastor wanting to lead your congregation with greater historical awareness, a seminary student building a foundation for a lifetime of ministry, or a committed layperson who simply loves the Church and wants to understand it more deeply — this school is for you. Come with your questions. Bring your own tradition's practices and let them be illuminated by the long story of which they are a part. I look forward to thinking through this material with you.
— Theoria
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- 6 modules, 29 lessons
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