Books against mainline liberalism would be J. Gresham Machen’s Christianity and Liberalism, Roger Olson’s Against Liberal Theology, and The Fundamentals: A Testimony To The Truth (Baker Books, 4 vols).

I personally believe that Ken Ham’s view of “young earth creationism” is what the Bible plainly says about creation and origins. If you’re honestly seeking answers about this, then buy Four Views on Creation, Evolution, and Intelligent Design edited by Stanley Gundry. There’s also tons of free, intellectually rigorous creationist material available on creation.com.

If you’re a seeker and are struggling with honest skepticism about apparent Bible contradictions, then buy Norman Geisler’s When Critics Ask: A Popular Handbook on Bible Difficulties (Baker, 1992), and the bibliography in the back: “Select Books on Bible Difficulties.”

Agnostics seem to think they’re without guilt before God, because they say they just don’t know: and so why would God condemn them if he was fair and just? Lie! God expects people to trust in Him and place their faith in the unseen realities of the Gospel. Plus, how can they be guiltless since they always argue against every supernatural thing that happens to them?

Hebrews 11:1: “Faith is confidence in what we hope for and assurance about what we do not see.”