Our greatest need in the present historical moment is people who make God credible in this world by means of the enlightened faith they live. We need men who keep their eyes fixed on God, learning from him what true humanity means (p. 52).
Faith, according to the Holy Father, is the way Christians strive to be fully human, the answer Christians give to the question: how can we fully realize our humanity?
Faced with western culture which, by and large, submerges humanity in a struggle for meaning in a world seemingly bereft of transcendence, Benedict says we must turn to faith in God. Faced with a Europe that suffers a tragic loss of memory of its Christian roots, thus threatening its own continued existence, the Pope urges a return to Christian faith. In the face of cultures which habitually regard human persons as objects, our best hope for recovering an enduring meaning for our lives, affirms Benedict, is a return to transcendence, to belief in God.
He begins by noting that we all share a commonsense notion of "faith" without which our lives would be rather difficult. When someone informs us that our expected time of arrival at Chicago O'Hare is 6:15pm, or tells us to take two tablets before going to bed, or that the fertility rate in France is on the rise—if the person who informs us has a reasonable degree of expertise (e.g., this person possess knowledge that we lack), we generally believe him or her. This kind of everyday "faith" is ubiquitous, and human life as we know it would be impossible without it.
This kind of everyday human "faith" is really more on the order of trust, and it relies on human knowledge: I may not know why or how X is the case, but someone does, so I therefore believe that X is the case.
It is precisely this kind of "faith" that raises a contemporary hurdle for the act of Christian faith: