I don’t find it that doubtful at all that that statement attributed to Jesus was added by writers later as embellishment. There’s plenty of talk about the whole of the Resurrection being a later addition to the Bible story (I’ve read this in several paper sources, I’ll try to find an online cite), so I find it entirely plausible that writers embellished or flat-out added to Jesus’ words.
I read the Bible with the same type of analysis I apply to reading Arthurian mythological texts… documents that were written many years after the facts (if they are facts at all) in question, by writers who were either relying entirely upon distant memory or secondhand accounts, and have been subsequently translated by others, often several times, before they actually reach our eyes. Given the number of filters these documents (meaning both Biblical and Arthurian source material) have had to pass through to reach modern eyes, I find it difficult to believe that they have survived completely intact. Think of a tin-can phone, stretching through history… each connection distorts the message slightly. After so much time, we can only rely on what can be verified from multiple sources, which isn’t much. Language itself becomes a barrier when enough time has passed.
Reading the modern translation of the Bible as a literal historical document is, to me, simply inaccurate. Unless you have a seperate source to verify what it says (which is true for some of it, such as the Flood and the Tower of Babel), then I take most of it with a rather large helping of salt.
Now, even if we ignore all of that and assume that the words are correct as written, I agree with CyberPundit’s opinion on the matter: Lewis’ explanation is too simplistic, and only holds if you agree with his assumptions, which are many. When I read Mere Christianity a couple years ago, I was impressed by the fact that it presented most of what it had to say quite reasonably, contrary to many defenses of Christianity I hav had the misfortune to read. However, the whole thing is, as you can see in the passage quoted by David Simmons, based on a number of pretty obvious assumptions. Lewis considers them to be “obvious universal truths,” as he states earlier in the book, but they were pretty clear assumptions about morality, reality, and faith. If you don’t accept his assumptions (which I did not), then the whole of the book simply falls flat.
As David Simmons summed up:
Lewis proves that he believes what he believes very convincingly and reasonably in Mere Christianity, but for those who do not share his beliefs and assumptions, most of his argument is empty. The OP topic is one example.