Jim Wallace explains to Bobby Conway (for our sake, of course) why scribal errors do not prevent us from understanding what the New Testament writers originally wrote.
I hasten to add that scribal errors are simply a fact of life for all pre-printing press literature. This is because, of course, all copies were written by hand. To toss out the Bible because of scribal errors would mean tossing out all literature written before the invention of the printing press. This would be ridiculous. To single out the Bible for this sort of skepticism is simply a case of applying a double standard (Double Standards in Reception of Ancient Documents and Their Authors).