Confessions of a Doubting Thomas

I was raised with Protestant, Conservative Evangelical, Christian beliefs. As a teenager I made a decision to follow Christ. It wasn't until many years later that I began to doubt some of my presuppositions. I now appear to be having a mid-life crisis-of-faith. Is (my) faith reasonable? Is it justifiable? Or is "the case for faith a case for ignorance"? (Dan Barker)