One of the criticisms of religion is that it calls for “blind faith,” which typically refers to believing without reason or objective factors. Christian faith is not blind faith since it is both supported by objective factors and is reasonable.
Objective factors can include such things as personal experiences of divine intervention as well as the testimony of credible witnesses. The Gospels were written to present such credible witness that others may believe in an act of rational faith (John 20:31). It is precisely the credibility of witnesses that substantiates the credibility of their testimony. The Apostles were such credible witnesses as they persevered in their testimony of Jesus’ life, death and resurrection even when being martyred or exiled for it. Their testimony gains credibility because others bear witness to it as well (1 Corinthians 15:6).
Christians believe in response to evidence, not in the absence of it.