we live by belief

There are in the life of a human being many more truths which are simply believed rather than truths which are acquired by the way of personal verification. Who, for instance, could assess critically the countless scientific findings upon which modern life is based? Who could personally examine the flow of information which comes day after day from all parts of the world and which is generally accepted as true? Who in the end could forge anew the paths of experience and thought which have yielded the treasures of human wisdom and religion? This means that the human being - the one who seeks the truth - is also the one who lives by belief. In believing, we entrust ourselves to the knowledge acquired by other people... Belief is often humanly richer than mere evidence, because it involves an interpersonal relationship and brings into play not only a person's capacity to know but also the deeper capacity to entrust oneself to others, to enter into a relationship with them which is intimate and enduring...

- Pope John Paul II

For Christians, belief in God is not blind. Like the many truths of science, belief in God is based on knowledge.