If Paul was a literalist in belief, why doesn't he say so?
He does.
Romans 5;
Sin entered the world through one person (5:12).
Many people died through what one person did wrong (5:15).
The judgment that came through one person’s sin led to punishment (5:16).
Death ruled because of one person’s failure (5:17).
Judgment fell on everyone through the failure of one person (5:18).
Many people were made sinners through the disobedience of one person (5:19).
There are those, of course, who say Paul's words may be interpreted allegorically, but the words and their meaning are clearly related to Redemption.
So if you relate the origin of sin, one persons disobedience, to the need for redemption, you cannot say the former is allegory but the latter is literal without the whole thing falling apart.
No, I meant, if he was a literalist, why didn't he say so? Rather than allegorically describing the past, as you describe above.
Why would he have to say that he was a literalist, when his comments are references to what he considered to be literal personages, a literal Adam, the one who brought sin into the world, and Jesus who, as the redeemer, atones for that sin.
If there is no sin through Adams disobedience, there is no need for redemption.
Paul's references are quite specific: ''When Adam sinned, sin entered the world. Adam's sin brought death, so death spread to everyone, for everyone sinned.'' 5:12
Creation.com puts the necessity for integrity well enough, even though they are wrong about its veracity;
Adam and Christ must be equally historical
Paul is using a typology in this passage which requires Adam and Christ to be equally historical; he is arguing that both individuals acted in ways that had real and lasting consequences in human history. It is impossible for either to be symbolic for Paul’s argument to be coherent. Paul sees Adam and Christ as history’s two most important figures: Adam causing humanity’s downfall by his disobedience, and Christ triumphing over that downfall by his obedience.15 Using Adam as a type of Christ sets the stage for the contrast between ‘I’ in chapter 7 and the person in Christ in chapter 8.16 A literal interpretation of the first few chapters of Genesis, then, underlies a fairly large section of Romans.
This passage is not the only place where Paul clearly regards Genesis to be a historically accurate document. Three chapters later, Paul points out that the whole creation was subjected to futility because of the Fall.17
Also, in another epistle, 1 Corinthians 15, Paul calls Jesus ‘the Last Adam’, bringing resurrection from the dead, in contrast to ‘the first man, Adam’, who brought death. And in 1 Timothy 2, Paul teaches on the role of men and women in church by appealing to the order of creation, Adam being created before Eve and the fact that Eve was deceived and Adam was not.18
Conclusion
It is not uncommon to read commentaries on Genesis that argue that the first 11 chapters are poetic, or that Adam was just a symbol for all mankind. However, as shown here, Paul’s argument depends completely on a historical individual man called Adam, who committed a real sin bringing real death. Otherwise, why believe in a real historical Jesus who brought justification from sin? No, it is clear from this passage, and many others in both the Old and New Testament, that Scripture itself takes Adam to be a historical person, and the Fall to be a historical event.19 Without these historical facts, the Gospel itself has no foundation (cf. Psalm 11:3).''
Now don't get me wrong, I am not a theist and I do not take Genesis literally or the Gospels literally....I am arguing that for the sake of the integrity of the narrative that underpins Christianity, you cannot pick and choose things that integral to the narrative, fall, redemption, etc, claiming that this is too be taken figuratively, but that is literal....a literal Christ but a figurative Creation account, because the integrity of the story falls apart, regardless of it being a work of fiction.