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I've been taught that when it comes to trying to interpret scriptures, you first have to always consider what original author was trying to convey to the original audience. There's a cultural/historical context. There's also different genres of writing, and specific literary conventions that were unique to the ancient Near-East cultures.
So with Genesis, yes, it's a compilation of oral traditions. And their point was not to provide a literal timeline or exact geneological record of earthly history. The purpose of Genesis--especially the first 13 chapters or so (up through the story about the tower of Babel) was to provide a polemic against the other religious views of the ancient near-east. Its purpose was to show that the God of Israel is not like the gods of other countries, that He is orderly, in control, and that He created humanity to be His image. So these stories share some details with the myths of other cultures of the time. But they differ in how the Creator is portrayed (omniscient and good, wise and in control, compared to petty, scheming, and dangerously out of control as in other myths) and in how humans are portrayed (created to be representatives of God, compared to slaves or demigods as in other myths).
All this to say that trying to use the Genesis stories to calculate the age of the earth is a misuse of the scriptures. The original author and audience would never have dreamed of such a thing. It would seem absurd to them. What's the point? That's not what those stories are for.
Same with the geneologies. The point is not to calculate. That's a western-culture mindset--facts, figures, calculations. No. To an ancient Near-East standpoint, geneologies are shorthand for stories. They're a way to remember your family history. To know where you came from and where you are going. In fact, geneologies often left out certain ancestors or generations. It depends on the purpose of the geneology. For example--Jesus' geneologies in Matthew and Luke have some very specific differences. It has to do with the authors' purposes for writing their gospels. So trying to calculate back based on geneologies is not going to be very accurate because the geneologies are going to have gaps and inconsistencies because they're there to provide a qualitative record, not a quantitative one.
As far as Methuselah and others who lived hundreds of years??? Who knows? I don't think it's necessarily an impossibility, given what we are learning about how the environment and our lifestyle affect our health and longevity. Thousands and thousands of years ago, before pollution, when the earth was healthier, when people ate fresh food and drank clean water, maybe they did live longer lives.
I do believe that the Bible is speaking the truth that humans weren't created to die. I do believe that the evil in the world and sin and all that is what brought death, disease, and destruction into humanity. Maybe that's partly because of my more conservative upbringing, but if so, I think that's one facet of conservative theology I will retain because it makes sense in the scope of things. So, with that, I think that it's quite possible that humans originally had the genetic capability to live for a very long time. And that it's possible that as our earth and our lives became unhealthier, that genetic ability was gradually eliminated. We already know that our bodies are amazing, complex organisms, so I would be hesitant to be adamant about lifespan when we really know very little about our own potential given more pristine conditions.
However, to sum up--no, I don't think it's accurate to use Genesis, geneologies, or ancient lifespans to try to calculate the age of the earth. And I don't even think it's particularly important to do so. There's so much richer wisdom and truth to be gleaned from the Bible--I don't know why some Christians feel the need to twist it into a science text book when it is so much deeper than that.
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