A diagnosis of how the gospel narrowed into something smaller — and why kingdom theology requires recovery
This is Part 2 of The Battle for the Christian Imagination. See also Part 1, “The Kingdom We Forgot How to Live In.”
In many churches that care deeply about salvation, discipleship functions as an important but secondary concern. Christians are encouraged to grow, to mature, and to follow Jesus more closely, but these expectations are often framed as optional rather than integral. Obedience is affirmed, but rarely assumed. Transformation is celebrated when it occurs, but unlike in the gospel of the kingdom Jesus actually announced, not treated as the normal outcome of Christian faith.
This raises a quiet but significant question: why does discipleship so often feel optional in communities that take the gospel seriously? If Jesus is confessed as Lord, why does learning to live under His leadership frequently appear as an extra layer of commitment rather than the center of Christian life?
This is not a question of sincerity or devotion. It is a question of formation. Something has come apart between what Christians profess to believe about Jesus and how that belief shapes everyday life.
Table of Contents
The disconnection between belief and lived life
Most Christians can clearly articulate the core elements of the gospel as they have received it. Jesus died for sin. Forgiveness is offered by grace. Eternal life is promised. These truths are affirmed with confidence and often defended vigorously.
Yet many of those same Christians experience uncertainty when it comes to how faith relates to ordinary, embodied life in the present. Work, money, relationships, desire, anxiety, and power often feel only loosely connected to the saving work of Christ. Faith remains true, but abstract. Correct, but difficult to inhabit.
As a result, discipleship is frequently framed as a personal decision rather than the normal trajectory of belief. One may choose to “go deeper,” pursue spiritual disciplines, or take Jesus’ teachings seriously, but these practices are not presented as intrinsic to the gospel itself. Belief becomes the endpoint rather than the doorway.
This disconnection did not emerge because the church rejected the gospel. It emerged because the gospel was gradually reduced.
How belief replaced apprenticeship
Over several centuries, Western Christianity increasingly learned to define faith in cognitive terms. The Enlightenment did not merely elevate reason; it reshaped what it meant to know something as true. Knowledge came to be understood primarily as intellectual assent, and belief as inward certainty rather than embodied trust.
Within Protestant theology, this shift subtly narrowed the center of gravity. Justification by faith, a vital and biblical doctrine, was increasingly emphasized in isolation from the broader context of transformation. Forgiveness remained central, while formation slowly receded from view. Salvation was framed primarily as a status one received rather than a life one entered.
During this period, Jesus’ teachings retained their authority but lost their function. They were no longer treated as practical instruction for life under God’s reign, but as moral ideals or ethical aspirations. The Sermon on the Mount, for example, was admired for its beauty and difficulty, yet quietly categorized as unrealistic or symbolic rather than livable.
The result was a form of Christianity in which belief was preserved with great care, while apprenticeship to Jesus was treated as exceptional.
How kingdom theology gave way to sin management
At this point, the gospel quietly shrank. It was not denied or rejected, but narrowed in scope. The message Jesus proclaimed — the gospel of the kingdom — was gradually reduced to a message focused primarily on sin management and future salvation. What had been an invitation into kingdom theology, into a livable life under God’s reign, became something closer to a transaction about eternal destinies.
As Dallas Willard famously observed, the church retained forgiveness but lost apprenticeship. Christians were taught how to have their sins forgiven, but not how to live as students of Jesus. Salvation was understood as rescue from punishment rather than entrance into the gospel of the kingdom — a new way of life under God’s reign that Jesus expected His followers to actually inhabit.
This reduction did not produce theological liberalism. It produced theological incompleteness. The church remained orthodox in belief while becoming increasingly thin in formation.
When salvation is framed primarily as a solved problem rather than an ongoing life, discipleship inevitably becomes optional. Obedience is recast as personal zeal. Transformation becomes aspirational rather than expected.
What the gospel of the kingdom actually announces
Jesus did not announce a message primarily about how to escape the world. He announced that the Kingdom of God had drawn near (Mark 1:14-15, ESV). His proclamation — what the New Testament actually calls the gospel of the kingdom — assumed that God’s reign was not only real, but available, and that life under that reign could be learned.
To follow Jesus, in this vision, was not simply to believe certain truths about Him, but to become His apprentice. Discipleship meant learning how to live with God at the center of every dimension of life. Obedience was not a way of earning favor, but participation in a reality already being given.
This life was never presented as a human achievement. It was made possible only by the presence and power of the Spirit, who enables people to trust God deeply enough to live differently. The Kingdom was not an abstract ideal, but a concrete way of life meant to be inhabited here and now.
Why imagination withered
When the gospel was reduced, imagination lost its theological home. A gospel centered almost entirely on forgiveness and future hope offers little for imagination to inhabit in the present. If salvation concerns where one goes after death, there is no lived world to envision now, no shared practices to rehearse, and no concrete way of life to embody.
Imagination does not create the Kingdom, but it does help people perceive what kind of world they are living in and what kinds of actions make sense within it. When the Kingdom is treated as distant or symbolic — when the gospel of the kingdom is reduced to a transaction about forgiveness — imagination either goes dormant or looks elsewhere for meaning and plausibility.
This helps explain why faith can remain doctrinally intact while feeling fragile. Belief survives, but without a lived vision robust enough to sustain trust and obedience.
Why recovering the gospel of the kingdom matters for everything else
This article is foundational because it explains why so many of the church’s later challenges became inevitable. When the gospel shrank, discipleship lost its central place. When discipleship collapsed, formation weakened. When formation weakened, imagination was left untethered.
Recovering a faithful Christian imagination cannot begin with creativity or cultural engagement. It must begin with recovering the gospel Jesus actually preached — the gospel of the kingdom — a gospel that invites real people into a real way of life under God’s reign, sustained by grace.
This is the work the rest of The Battle for the Christian Imagination undertakes. Subsequent articles trace how kingdom theology was buried under other theological conversations (Part 3: Why Belief Survived While Discipleship Didn’t), how the imagination atrophied as a result (Part 4: The Imagination Gap), and how a coherent recovery is possible.
FAQ
What is the gospel of the kingdom?
The gospel of the kingdom is the good news Jesus actually preached — that God’s reign has drawn near in Him and that humans can enter that reign now (Mark 1:14-15, ESV). It is not only news about forgiveness and future heaven. It is news about a livable, present reality that Jesus invites His followers to inhabit through apprenticeship to Him.
How is the gospel of the kingdom different from how the gospel is usually preached?
Most contemporary preaching emphasizes forgiveness of sins and the promise of eternal life — both biblical, both true, but only part of what Jesus actually announced. Dallas Willard called the reduced version a “gospel of sin management,” because it focuses on managing the problem of sin rather than entering the new way of life under God’s reign. The gospel of the kingdom is the fuller proclamation, holding forgiveness and formation together.
What is kingdom theology?
Kingdom theology is the theological tradition that takes seriously Jesus’ announcement that the Kingdom of God is both already present and not yet fully consummated. It draws on the work of George Eldon Ladd, N. T. Wright, Dallas Willard, and others who have argued that the Kingdom is a livable reality now, not only a future hope. Kingdom theology insists that Christian discipleship is participation in God’s reign in the present.
Why did the gospel shrink historically?
Several centuries of Western Christian thought, especially after the Enlightenment, narrowed faith into intellectual assent and salvation into a personal status. Within Protestantism, justification by faith was emphasized in isolation from broader formation. Jesus’ teachings retained authority but lost function — they became moral ideals rather than practical instruction. The result was a Christianity strong on belief and thin on apprenticeship.
Can the gospel of the kingdom still be recovered?
Yes, but recovery is slow and requires both theological reorientation and practical formation. It begins with recognizing that the gospel Jesus preached is bigger than forgiveness alone — it is an invitation into a way of life. From there, recovery happens through learning to apprentice to Jesus, taking His teachings seriously as practical instruction, and rebuilding the imaginative and communal practices that make kingdom life livable.
Continue the series
The Battle for the Christian Imagination is a fourteen-part series tracing how the gospel of the kingdom narrowed, how the Christian imagination atrophied, and how the Church can recover an embodied vision of life under God’s reign.
Read Part 3: Why Belief Survived While Discipleship Didn’t
Or follow Zach’s writing on Substack at substack.com/@zacharyleighton for ongoing thinking on kingdom theology, formation, and the imagination of the Church.
