This lecture by Dr. Richard Carrier will definitely give you something to think about (please note that the video is linked to start about half hour into the video which is when the lecture starts):
http://www.youtube.com/watch?v=ILldt2XHZw0&feature=player_detailpage#t=1659
If the timing doesn't work just move the play head to the 27:00 mark. I think there is also a link in the video to jump to the start of the lecture.