Support the work
Theology in Focus

Theology, church history and apologetics.

Theology

Study what Christians teach about God, Jesus Christ, Scripture, sin, salvation, the church, and the Christian life. Begin with broad introductions, then follow a doctrine into related articles. The index lets you search the published library by subject; some searches may have no matching article.

Browse subjects

Study by subject

Each subject link searches the published library. The notebook index is a planning reference, so some doctrines do not yet have a published treatment.

Salvation (soteriology)
Jesus Christ (christology)
The church (ecclesiology)
God and his attributes
Humanity and sin
The Holy Spirit
Scripture and hermeneutics
The last things (eschatology)
Angels and spiritual evil

Follow a reading path

Move from an introduction to Christian doctrine through foundational questions about Christ, the gospel, sin, grace, and the cross.

Start here

Begin with the scope of systematic theology, then consider who Jesus is and what the gospel announces.

  1. 1What Is Systematic Theology? An Introduction
  2. 2Who Is Jesus?
  3. 3What Is the Gospel?

Go further

Read how the articles define sin and grace, and why those teachings matter for salvation.

  1. 1What Is Sin?
  2. 2What Is Grace?

Read in depth

Examine the article on the cross, including its account of sacrifice, substitution, reconciliation, and the resurrection.

  1. 1Why Did Jesus Have to Die?

Browse the collection

God and Scripture

What Is Heaven?

Scripture describes two events, not one: a purging on the pattern of Noah that opens the millennial reign, and a wholly new creation after the thousand years.

10 min read

Can a Christian Lose Salvation?

Scripture speaks with two voices on eternal security. Salvation cannot be lost by any sin or weakness, and the warning passages describe something else entirely.

6 min read

What Is Grace?

Grace is the free and undeserved favor of God toward those who have earned the opposite, favor that pardons sinners completely and transforms them entirely.

6 min read

What Happens When We Die?

Death is a separation, not an ending. Scripture describes conscious life after death, a coming judgment, and the resurrection of the body as the Christian hope.

5 min read

Why Did Jesus Have to Die?

The death of Christ was sacrifice, substitution, and reconciliation at once, satisfying divine justice and revealing that the love which saves originates in God.

6 min read

Christian belief and life

What Is the Church?

The New Testament word ekklesia means a called-out assembly, never a building. What the church is, how the word drifted, and what the Reformation recovered.

6 min read
Search all theology material in the library

Latest articles in theology

Recent published articles in this field, from the maintained catalogue.

What Is Heaven?

Scripture describes two events, not one: a purging on the pattern of Noah that opens the millennial reign, and a wholly new creation after the thousand years.

10 min read

Can a Christian Lose Salvation?

Scripture speaks with two voices on eternal security. Salvation cannot be lost by any sin or weakness, and the warning passages describe something else entirely.

6 min read

What Is the Church?

The New Testament word ekklesia means a called-out assembly, never a building. What the church is, how the word drifted, and what the Reformation recovered.

6 min read

What Is Grace?

Grace is the free and undeserved favor of God toward those who have earned the opposite, favor that pardons sinners completely and transforms them entirely.

6 min read

What Happens When We Die?

Death is a separation, not an ending. Scripture describes conscious life after death, a coming judgment, and the resurrection of the body as the Christian hope.

5 min read

Why Did Jesus Have to Die?

The death of Christ was sacrifice, substitution, and reconciliation at once, satisfying divine justice and revealing that the love which saves originates in God.

6 min read
Browse the complete theology catalogue