Below is a collection of resources from the archives of Ligonier Ministries for those inquiring about Christianity.
Inquiring About Christianity: Serious answers for serious inquirers. Who is Jesus and what did He do? Can I know truth? What is the gospel and why is it good news?
Wounded for Our Transgressions by W. Robert Godfrey
Forgive Us Our Trespasses by Philip Ryken
An Everlasting Love: The Love of God by John MacArthur
Who Is Jesus? by John MacArthur
Good News in a Fallen World by Joni Eareckson Tada
The Nature of Saving Faith by Sinclair Ferguson
What Is the Standard of Truth? by R.C. Sproul
Exchanging the Truth for a Lie by R.C. Sproul
The Holiness of God with Dr. R.C. Sproul
Understanding the Gospel with Dr. R.C. Sproul
More resources available here.