How Evolution Explains "Original Sin"

The Apostle Paul writes,
"By one man [Adam] sin entered the world,
And death thru sin"(Romans 5.12).
Supposedly we inherit sinfulness from Adam.
 
Evolution says something similar:
We inherit animality from our forebears,
Namely all the animals:fish,reptiles,mammals
That helped create our bloodline, our DNA.
 
While Paul goes back to the original man,
Science and Evolution goes back still further.
But the Bible and Evolution agree on this much:
Our sinful nature is INHERITED!
 
My point is that our urges are not ours alone,
(Our predispositions, our inborn tendencies)
So much as a legacy from the distant past.
 
Paul says,"If I do what I do not want,
It is no longer I that do it,
But sin that dwells in me"(Romans 7.14-20).
He continues,"For I delight  
in the law of God in my innermost self.
But I see in my members another law
At war with the law of my mind,
Making me captive to the law of sin  
That dwells in my members"(Romans 7.22-23).
 
What is this "law of sin" that Paul speaks of?
Evolution accounts for it!
It is none other than our animal nature
Which we inherit from our nonhuman ancestors!
 
"The flesh lusteth against the Spirit  
And the Spirit lusts against the flesh.
For they are opposed one to the other"(Galatians 5.17-21).
"The flesh" would stand for those parts  
of the brain which predate man,
(For example, the brain stem,
The only brain that a fish has).
While "the Spirit" would represent or relate to  
the uniquely human brain,our higher nature.
 
To sum up, science says our lusts and animality
Goes back to the animals (that God used to produce us).
While Paul tracks it back only as far as Adam.
But this doesn't make the Bible wrong.
While Paul's words aren't the full truth,
They are, at least, "a shadow" of the truth.
The true explanation has come via science.
 
Paul has explained to us that "the Law of Moses,"
Which was written 1,500 years before his time,
"Contains a shadow of good things to come,
Rather than the actual truth"(Hebrews 10.1).
Well, it turns out that this "shadow" concept  
Applies to Paul's words as well,
Words written 2000 years before our day.