Actually (and off-topic) ... that age of earth number is only believed by *some* christians. Many christian scholars don't subscribe to the "4000yrs" idea because the author of that computation had to make some really serious guesses and estimation to connect generations and ages to get his number. Also many christian scholars don't necessarily hold with the creation stories as anything other than metaphors or poetic descriptions. There's not a unified opinion on scripture (if there were, there wouldn't be hundreds of sects and divisions).
I won't debate the human origination stories as they are irrelevant to this discussion.
Genetics, social custom, misinformation, loose definitions, and religious taboo tend to dominate the subject of "incest".
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