Apologetics attempts to respond to questions or assaults on Christianity using rational and logical arguments, rather than ones based on faith alone. Some of the questions tackled include - Who IS God? Is the Bible the word of God? Can miracles happen? Is the theory of evolution true? Why does a good Creator allow evil to exist? Did the doctrines in the New Testament come from paganism? If the Eternal can do ANYTHING can he LIE?
Apologetics routinely makes rational arguments for God's existence, such as the famous five proofs the great Catholic theologian and philosopher Thomas Aquinas gave near the beginning of his "Summa Theologica." It may also deal with specific attacks on various doctrines, such as whether Jesus is God (and not just the Son of God).
There are many books on defending Christianity and it beliefs that are available to the public. Some of the leading writers of Christian apologetics include the following (along with books they have written).
Miracles and The Problem of Pain by C.S. Lewis
The Screwtape Letters and Mere Christianity by C.S. Lewis
The New Evidence That Demands A Verdict: Fully Updated by Josh McDowell
More Than a Carpenter by Josh McDowell
Scientific Creationism by Henry Morris
Evolution? the Fossils Say No! by Duane Gish
The Case for Christ: A Journalist's Personal Investigation by Lee Strobel
Still other excellent books include the following.
New International Encyclopedia of Bible Difficulties by Gleason Archer
The New Testament Documents: Are They Reliable? by F.F. Bruce
Christian Apologetics by Norman L. Geisler
Scaling the Secular City: A Defense of Christianity by J.P. Moreland
A Zeal For God Not According to Knowledge by Eric Snow
Why should Christians be somewhat proficient in apologetics? Why should they be grounded in defending the word of God? There are many Biblical skeptics in the world who attack the idea that God exists or who argue against what the Bible teaches. Believers would do well to be able to offer rational replies to such criticisms so that they can "encourage with sound doctrine and to convict those who are gainsayers" (Titus 1:11).