And this is definately an area where we Orthodox could step it up in defense of our faith. There is some material out there, but I don't think that there is enough. Works like John Breck's book Scripture and Tradition: The Bible and its Interpretation in the Orthodox Church, for example, which attempts to demonstrate that the Gospel of John was all written by a single author, among other things, just doesn't come up on the radar of most people. It doesn't have the buzz of being an apologetic book, and it's given no marketing push (not that we push ANY book except those by a few select authors) so it isn't as widely read as it could be. Actually, I find Breck's use of the Chiasmus (his main argument) unconvincing, but that's the whole point: there should be a larger debate going on here within Orthodox and Orthodox/Other Christian contexts, not just a book or two published every few years which tries to dispute the volumous output of liberal scholars.