First, I don't think any of us are suggesting that the entire book of Genesis is metaphor. For my part, I have been restricting my comments to the creation account. And I believe that parts of it probably are indeed literal - I am inclined to believe, for example, that there was an "Adam" (although I think he was produced by evolution).
You are quite correct. There was a literal Adam. The following list from Luke 3:23-38 shows that:
Now Jesus himself was about thirty years old when he began his ministry. He was the son, so it was thought, of Joseph, Heli, Matthat, Levi, Melki, Jannai, Joseph, Mattathias, Amos, Nahum, Esli, Naggai, Maath, Mattathias, Semein, Josech, Joda, Joanan, Rhesa, Zerubbabel, Shealtiel, Neri, Melki, Addi, Cosam, Elmadam, Er, Joshua, Eliezer, Jorim, Matthat, Levi, Simeon, Judah, Joseph, Jonam, Eliakim, Melea, Menna, Mattatha, Nathan, David, Jesse, Obed, Boaz, Salmon, Nahshon, Amminadab, Ram, Hezron, Perez, Judah, Jacob, Isaac, Abraham, Terah, Nahor, Serug, Reu, Peleg, Eber, Shelah, Cainan, Arphaxad, Shem, Noah, Lamech, Methuselah, Enoch, Jared, Mahalalel, Kenan, Enosh, Seth, Adam, God.
If Adam wasn't literal then somewhere this ancestry changes from fact to fiction as it ends with Adam then God. If Adam was a result of evolutionism the
Romans 5:12 is wrong as well as much of christian theology concerning our sin nature.
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.
In
1 Cor 15:21 we read 21 For since death came through
a man, the resurrection of the dead comes also through a man. 22 For as in
Adam all die, so in Christ all will be made alive.
Evolution tells us populations evolve...and the Theo-Evo sects tells us sin wasn't a product of one man named Adam but instead evolved through and into the population. If Adam was a man in that evolving population then Adam would have had parents, neighbors, cousins, Eves relatives....all being sinless. A sinless population living and producing a progeny. They would have been a race of people living side by side with Adam and Eves progeny.
But, that isn't what the bibl teaches.
The bible teaches in
Acts 17:26 .... And he made from
one man every nation of mankind to live on all the face of the earth, having determined allotted periods and the boundaries of their dwelling place,
The bible clearly denies God used evolution to populate the earth.
Now, if you want to say...(although I think he was produced by evolution)...you need to get around these verses.