For starters, the bible is grounded in reality. It does not proclaim fantastic events to explain why there is lightning or how the sun rises every morning. The fact the Christianity has survived so long and claimed such an important stake in human history, literaly defining world events across many nations and cultures, also attests to its truth. If there was nothing to it to grasp onto, no ring of truth, then it would not move so many people so profoundly.
