Former atheist Lee Strobel investigated Christianity in order to disprove it, but surprisingly came to believe it was true based on the evidence.

Lee's Resources

The Lee Strobel Center for Evangelism and Applied Apologetics: strobelcenter.com

Books:

Is God Real? (latest book)

The Case for Christ

The Case for Faith

The Case for the Creator

The Case for Heaven

Spiritual Mismatch with Leslie Strobel

The Unexpected Adventure with Mark Mittleberg

Resources Mentioned by Lee

Simon Greenleaf, The Testimony of the Evangelists: The Gospels Examined by the Rules of Evidence

Albert Schweitzer, The Quest of the Historical Jesus

Norman Geisler, Roots of Evil

J.I. Packer, I Want to Be a Christian and Knowing God

Josh McDowell, Evidence that Demands a Verdict and More Than a Carpenter

John Stott, Basic Christianity

Frank Morrison, Who Moved the Stone?

C.S. Lewis, Mere Christianity and Screwtape Letters

John Warwick Montgomery, Where is History Going: Essays in Support of the Historical Truth of Christ, The Is God Dead? Controversy, How Do We Know that There’s a God?

G.K. Chesterton, The Everlasting Man

Thomas Aquinas, The Summa Theologica

Blaise Pascal, Pensees'

Francis Schaeffer, The God Who was There

Bertrand Russell, Why I'm Not a Christian