Certainty is the intellectual heritage of Modernity...
...and with it comes an attendant fear of mystery.
Our culture, however, is growing ever fonder of mystery, is embracing ambiguity, and is growing increasingly apprehensive about certainty. As Christians raised in a modern Church attempting to reach a modern world, we look at our culture's growing mistrust of certitude, and we are either frightened or disgusted. We fear the erosion of truth, or we are disgusted by the obvious attempt at self-justification for a hedonistic lifestyle...
But I would ask that we suspend judgment for a moment.
I do not think Christianity should be equated to certitude. There are a few things about which we must be certain (Paul argues this in 1 Corinthians 15 about the physical resurrection of Jesus) but there are many things about which we should be ambiguous! In our attempts to be Biblical we have made claims for certainty, but in fact, we must acknowledge that where the Bible is ambiguous, it is unbiblical to be unambiguous!