Theologians and secularists debate its meaning and implications ad nauseum, but for me--a word freak--it's really quite elementary.
Faith is not and never has been about certainty. The word dates to the 13th century and embodies belief itself through its myriad contextual uses. But here's the thing (and I'll use a sports analogy): it's similar to being ahead 21 points heading into the 4th quarter. More than likely, you'll win. Yet you have to compete knowing that it's still possible to lose.
Faith allows for doubt--a probing, intellectually curious kind of doubt. The kind of uncertainty that seeks to further its own understanding for the purposes of unearthing deeper knowledge. So I'll leave you with this head-scratcher. If doubt didn't exist, would faith?