At present, we are working with the light of truth presented by Dr. Francis Schaeffer from his book True Spirituality.  Part 2

The question before us is what the Christian life, true spirituality, really is, and how it may be lived in a twenty first-century setting. The first point that we must make is that it is impossible even to begin living the Christian life, or to know anything of true spirituality, before one is a Christian. And the only way to become a Christian is neither by trying to live some sort of a Christian life nor by hoping for some sort of religious experience, but rather by accepting Christ as Savior. No matter how complicated, educated, or sophisticated we may be, or how simple we may be, we must all come the same way, insofar as becoming a Christian is concerned. As the kings of the earth and the mighty of the earth are born in exactly the same way, physically, as the simplest man, so the most intellectual person must become a Christian in exactly the same way as the simplest person. This is true for all men everywhere, through all space and all time. There are no exceptions. Jesus said a totally exclusive word: Jesus said to him, “I am the way, and the truth, and the life. No one comes to the Father except through me.” (John 14.6 NIV) 

The reason for this is that all men are separated from God because of their true moral guilt. God exists, God has a character, God is a holy God; and when men sin (and we all must acknowledge we have sinned not only by mistake but by intention), they have true moral guilt before the God who exists. That guilt is not just the modern concept of guilt-feelings, a psychological guilty feeling in man. It is a true moral guilt before the infinite-personal, holy God. Only the finished, substitutionary work of Christ upon the cross as the Lamb of God—in history, space, and time—is enough to remove this. Our true guilt, that brazen heaven which stands between us and God, can be removed only upon the basis of the finished work of Christ plus nothing on our part. The Bible’s whole emphasis is that there must be no humanistic note added at any point in the accepting of the gospel. It is the infinite value of the finished work of Christ, the second person of the Trinity, upon the cross plus nothing that is the sole basis for the removal of our guilt. When we thus come, believing God, the Bible says we are declared justified by God, the guilt is gone, and we are returned to fellowship with God—the very thing for which we were created in the first place.

Thoughts developed or used directly from the work of Schaeffer, Francis. True Spirituality . Tyndale House Publishers, Inc