Regarding critical Bible scholarship, the group often recognized as preeminent authorities on the historical analysis of Christianity is the "Westar Institute", which is a kind of think tank for some of the most rigorous Biblical scholars like Burton Mack, Dominic Crossan, Robert Funk, etc. (These are all highly credentialed professors, and most are also Christians). Here's the link...
These scholars have published several books providing a word-by-word analysis of the New Testamant, including a probability factor for the likelihood that Jesus actually said what was attributed to him. (As I recall, in the end they estimated that about 50% of all words attributed to him were never spoken by him).
For Biblical criticism from an established Christian priest, I'd recommend Episcopalian Bishop John Shelby Spong. His books are very interesting. He has basically declared all the miracles -- including the virgin birth and resurrection -- to be myths. His last book was titled "Why Christianity Must Change Or Die." Not surprsingly, he has received death threats over the years.
Another interesting one is the former Dominican priest Matthew Fox. For his criticisms of Roman Catholicism he was ordered into one year of silence by the then "Cardinal" Ratzinger, partly because Fox tried to have dialogue with Wiccans (Witches) and Native American spiritual teachers. He was eventually forced out of the priesthood, but not before publishing several excellent books.
For extreme criticism of the Bible you can turn to writers like the German scholar G. A. Wells or the British researchers Gandy and Freke who have have all published books offering scholarly arguments that Jesus did not even exist.
Personally I think the Westar Institute (link above) offers the most balanced critique on the matter.