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Unfaith turns Christianity into only a philosophy. Of course, Christianity is a philosophy -- though not a rationalistic one because we have not worked it out from ourselves. Rather, God has told us the answers. In this sense it is the true philosophy, for it gives the right answers to man's philosophic and intellectual questions. However, while it is the true philosophy, our Father in heaven did not mean it to be only theorectical or abstract. He meant it to tell us about Himself -- how we can get to heaven, but equally, how we can live right now in the universe as it is with both the seen and the unseen portions standing in equal reality. If Christians just use Christianity as a matter of mental assent between conversion and death, if they only use it to answer intellectual questions, it is like using a silver spoon for a screw driver. I can believe that a silver spoon makes a good screw driver at certain times. But it is made for something else. To take the silver spoon that's meant to feed you, moment by moment, and keep it in your tool box to use only as a screw driver is silly.

Francis Schaeffer
Death in the City (Downers Grove, InterVarsity Press: 1969) 139-40