Download a copy of “The Definition of Christianity” by John Lennox and David Gooding (no strings attached, no email required) from Myrtlefield House Publishers. They have a number of other free resources available too.
Christianity is not essentially a system of morality (as is Confucianism) that has to be adapted to the changing fashion of the centuries or else become outmoded. Nor is it a system of abstract universal philosophical truths, the validity of which is independent of the thinkers who first perceived them. Nor is it like many a pagan religion was, a system of rituals which depended for their effectiveness on being performed correctly.
About the authors (quoted from the book):
David W. Gooding is Professor Emeritus of Old Testament Greek at Queen’s University, Belfast and a Member of the Royal Irish Academy. He has taught the Bible internationally and lectured on its relevance to philosophy and world religions. He has published scholarly studies on the Septuagint and Old Testament narratives, as well as expositions of Luke, John 13–17, Acts, Hebrews and the New Testament’s Use of the Old Testament.
John C. Lennox, Professor of Mathematics at the University of Oxford, is an internationally renowned speaker on the interface of science, philosophy and religion. He regularly teaches at many academic institutions and teaches the Bible extensively. In addition to his academic works, he has published books exploring the relationship between science and Christianity. He has also participated in a number of televised debates with some of the world’s leading atheist thinkers.