The part of the OT that deals with the age of the Earth wasn't written in a metaphoric narrative. "Jack son of Drew son of Rusty son of Charlie son of Rick..." was written as a line directly from Adam and Eve all the way to what was then the present. Either it's the worst allegory in history (worse even than Neo being an allegory for Jesus) or it was supposed to be literal.
But that's really not important. My understanding of Christianity, my experience even, was that all the lessons you need come from the retellings of the story of Jesus. His words and actions, retold in gospels of Matthew, Mark, Luke and John, are supposed to be the entire foundation of Christian life, philosophy, and morality. The previous stuff, while not completely unimportant, was more about "Guess who's on his way? Jesus, that's who! But for now, here are some rules."
Anyway, Jesus never said "Oh, dude, you're not going to believe this: the Earth is only a few thousand years old! ROFL!" He never reiterated a lot of stuff from the OT. Why? You'd have to ask him, but my guess is that if he existed he didn't think it was as important as the stuff he did say.
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