I think this is actually a very valid question that Christians seldom address adequately. I think, however, it is most accurately addressed by Dr WLC in these vids.
http://www.youtube.com/watch?v=T3N_RAvksP4
http://www.youtube.com/watch?v=VbirUdSnZLU
http://www.youtube.com/watch?v=T3N_RAvksP4
http://www.youtube.com/watch?v=VbirUdSnZLU
I do not feel obliged to believe that the same God who has endowed us with senses, reason, and intellect has intended us to forgo their use and by some other means to give us knowledge which we can attain by them.
-Galileo
-Galileo