I have been busy with term starting here at Westminster. Anyway, I have managed to compile (for a friend) a very short list of books for Christians who do not really know much about the faith, whether young or just because of their environment in shallow Evangelicalism. Here is the short list of simpler (note: not necessarily simple) books (besides the Bible) that should be read for such believers to build a foundation for true biblical knowledge.
- John MacArthur, The Gospel according to Jesus
- John MacArthur, Hard to Believe
- John MacArthur, Ashamed of the Gospel
- Terry L. Johnson, Traditional Protestantism: The Solas of the Reformation
- James R. White, The God Who Justifies
Basic Christian doctrine
- James R. White, Scripture Alone
- J.I. Packer, Knowing God
- David Wells, No Place for Truth, or Whatever happened to Evangelical Theology
- Jerry Bridges, The Pursuit of Holiness
- Jerry Bridges, The Discipline of Grace
- Tim Challies, The Discipline of Spiritual Discernment
Hope this would be helpful. I'm sure there are other good books out there, but these are the ones that I currently own which I think are good and easy to read books for less doctrinal knowledgeable Christians.