The correct answer to the question “What is Christianity?” is this: Christianity is a picture of reality. It is an account or a description or a depiction of the way things actually are. It is not just a view from the inside (a Christian’s personal feelings or religious beliefs or spiritual affections or ethical views or “relationship” with God). It is also a view of the outside. It is a view of the world out there, of how the world really is in itself.
— Greg Koukl, from The Story of Reality, kindle location 294
The truth of Christianity is that it is true to what is there.
— Francis Schaeffer, From He Is There and He Is Not Silent
[Christianity] entails an objective reality outside myself that includes the reality of God’s existence and the truth revealed to us in His Word.
— Ronald Nash, from Great Divides, p. 12
The Christian faith is reasonable. It is no irrational, it is not blind, and it is not mere emotion. It is the faith brought about by the Word—living and written.
— Calvin Beisner, from Answers for Atheists at 2:24
Christianity is not denying reality. Biblical Christians don’t deny reality, they discover reality. And once they’ve discovered it, they act on what they’ve learned.
— Greg Koukl, from Faith and Facts, an article on str.org under Commentaries on Apologetics