The average NT manuscript is about 200 pages, and in all, there are about 1.3 million pages of text. No two manuscripts are identical, except in the smallest fragments, and the many manuscripts which preserve New Testament texts differ among themselves in many respects, with some estimates of 200,000 to 300,000 differences among the various manuscripts.[20] According to Bart Ehrman:
Most changes are careless errors that are easily recognized and corrected. Christian scribes often made mistakes simply because they were tired or inattentive or, sometimes, inept. Indeed, the single most common mistake in our manuscripts involves "orthography", significant for little more than showing that scribes in antiquity could spell no better than most of us can today. In addition, we have numerous manuscripts in which scribes have left out entire words, verses, or even pages of a book, presumably by accident. Sometimes scribes rearranged the words on the page, for example, by leaving out a word and then reinserting it later in the sentence.[21]
Textual tradition of the New Testament
Biblical inerrancy has been criticized on the grounds that many statements that are found in Scripture, if taken literally, rather than phenomenologically, are untenable or contradictory. Many (although not all) of these instances, involve the Bible's relationship with history or science. Inerrancy is argued to be a falsifiable proposition: if the Bible is found to contain any mistakes or contradictions, the proposition of strict inerrancy has been refuted.
Criticism
http://en.wikipedia.org/wiki/Biblical_inerrancy