And yet Romans 5 says:
Therefore, just as sin came into the world through one man, and death through sin, and so death spread to all men because all sinned (Rom 5:12, ESV2011)
To all life? Not necessarily - only to all men. And if you really were convinced that all death, whether animal or human (to say nothing of vegetable), was the odious consequence of human sin, you would have funerals not just for people but for pet dogs, swatted mosquitoes, and the trillions of animals who die yearly worldwide to feed your insatiable appetite - an appetite for which you have no problems in spreading the consequences of sin.
Yeah! I mean, let's allegorize the death and resurrection of Jesus - oh wait, we have a specific warning against that:
And if Christ has not been raised, your faith is futile and you are still in your sins. Then those also who have fallen asleep in Christ have perished. If in Christ we have hope in this life only, we are of all people most to be pitied. (1Cor 15:17-19, ESV2011)
Note that there is no similar specific warning against allegorizing the creation account, or anything else in the Bible for that matter.
And I really like clocking in on Sunday, so let's allegorize the Fourth Commandment - oh wait, since an allegory is actually a story for which I recognize the non-literal meaning to be more important than the literal meaning, I can't actually allegorize it, since "Thou shalt keep the Sabbath holy" is not even a story of anything, much less an allegory for anything.
I have a lot of gay friends too, so let's try to allegorize what Paul says in Romans 1! When he talks about men having desire for each other, that must be referring to ... a rugby game! Naw, doesn't quite work out, "homosexuality" can only be homosexuality. And when he talks about it being an error, that must be a metaphor for ... dirty clothes! Hmm, it's hard to see how "an error" can stand for anything other than, well, an error. So "homosexuality is an error" is an allegory for "homosexuality is an error"! Hooray, I've justified homose - oh wait.
The Bible is remarkably resistant to the kind of allegorization you imagine. What would you call someone who claims that something is possible when it actually isn't - and he's never tried it himself even once in his life? Hmm, I can't think of a polite word, but I'll get back to you on it.
If the Good Samaritan can be a fictional metaphor for a historical good person, why can't the first Adam be a fictional metaphor for a historical last Adam?
In any case, I have quite literally talked to Jesus before, and quite literally never talked to Adam before. QED.