And how exactly did Adam and Eve's actions in the Garden affect their DNA?
You guys keep overlooking the fact that Genesis makes it clear that the serpent in the Garden was one of the wild creatures. I've asked before and I'll ask again: Why does the Bible make the clear distinction that the serpent was one of the wild creatures if it was just Satan in disguise? No one's answered this question yet.
What was going to be the result if Adam disobeyed according to Gen 2v17 ?
Wasn't the penalty for disobedience going to be: death ?
However, Adam was not going to die immediately upon eating.
Fallen Adam [and all up to the time of Noah] could live up to one-thousand years before dying. [Adam lived 930 years].
Once Adam disobeyed he 'unplugged' himself from his Creator, his source of everlasting life. Just like a fan that becomes unplugged from its power source slowly winds down until it stops all together.
So, Adam, as our family head, loosing his human perfection before fathering children could only pass down his now imperfect DNA to us.
Adam , in a sense, passed down to us a sin-like birth defect that only Jesus has the cure. -Rev 22v2.
Gen [3v1] says the serpent was more subtle [KJV], or in other words,
more cautious than any other wild beasts of the field.
Gen [1v24] mentions bringing forth after its kind.
So, we have tame animal kind [domestic] or the wild kind.
In choosing between domestic or wild:
would you consider a serpent as being in the tame category or wild ?
There is nothing saying the serpent was Satan in disguise [costumed].
Satan could have thrown his voice to make it appear as if the serpent was actually talking just like a ventriloquist today could use his dummy.