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