What a wonderful discovery!! Every ancient manuscript that emerges enables us to verify and ensure the accuracy and completeness of the Bible we have today. One error I spotted - and it's probably just typical press hyperbole - this is certainly not the "oldest Christian book ever descovered." Codex Sinaiticus and Codex Vaticanus both predate it by a century, and there are numerous fragmentary manuscripts much older than them . . . the oldest New Testament manuscript in existence is Rylands Papyrus #22, which is a piece about the size of the palm of your hand with 6 verses from John Ch. 18 on it. It dates to about 125 AD, only 30 years after John's gospel was written.
What they probably meant was the oldest illustrated Christian book, which this one certainly appears to be. People forget how old Ethiopia's Christian community is. It claims to have been founded by the Ethiopian eunuch mentioned in the Book of Acts, but most scholars think it was begun in the 4th century by a Christian slave turned missionary named Frumentius.
I almost always learn something new when reading your post.