Great point to be made! I remember the first real light bulb after finding Christ and beginning to study His Word. I had begun attending the Thursday night Bible Study at my church and our Pastor started a new study on Phillippians. (prior to that we worked with The Wired Word, mostly) We had reached chapter 4, I think, when someone made a comment and Pastor Bob responded with "you have to remember, we know the rest of the story. When this was written they didn't." Put a HUGE new spin on everything for me. Rather a "duh" moment, really, but I hadn't ever thought of it like that.
He also made me realize how little we know about Mary, Mother of Jesus. And why do we know so little about Jesus' life as a small boy? There are lots of areas missing, details we are not privy to. I'm not saying it makes the stories any less true, just that the details aren't there and so we have to rely on faith that what we are told is enough.