In responding to Bill O'Reilly's recent expression of ignorance over how the tides are formed, comedian Stephen Colbert remarked "There must be a God because I don't know how things work." This pretty much summarizes not only O'Reilly's religious ignorance, but that of MANY believers. Because whenever we ask believers to provide proof for their fantastical belief that there is an invisible sky man who holds the Universe together, intervenes in our affairs, answers our prayers, smites our enemies and bestows knowledge upon us via revelation, they ALWAYS punt, retreating into vague mutterings and hand waving to explain away the very simple fact that they do not have any evidence.
The simple fact is that if there really WAS an invisible supernatural entity intervening in our daily lives, answering our prayers, smiting His enemies and revealing knowledge to us, the evidence would be literally EVERYWHERE. The evidence would be overwhelming. Instead, we have... ... ... ... silence.