On Original Sin

As we all know, the foundation of all the Abrahamic religions is the downfall of man in the garden of eden through the commission of "original sin" by Eve and consequently Adam. God forbade them specifically from eating the fruit of the tree of the knowledge of good and evil. They did anyway at the suggestion of the "serpent" and as a result were banished from the garden and forced into a life of grief and toil. Adam and Eve had children and the "sin" they committed when they ate the fruit was inherited by their children, Cain, Abel and Seth, and, I assume, all the other non-named children they must have had.
As an assay, by the logic of its bible, why doesn't christianity recognize that the whole of the human race must be descended from this first necessarily incestuous family. Cain, Abel and Seth had to have successfully mated with females, else we would not be here. It must have either been their mother or their unmentioned sisters. Disgusting.

How did we as the children of Cain, Abel and Seth come to acquire the "sin" of Adam and Eve?
Was it physically? Did we inherit it somehow? If so, this means we must necessarily have a sinful physical nature. What I mean is, if god created us in his image, never once "tweaking" us after the initial creation, then our physical makeup is the same post-original sin as it was pre-original sin, which in turn means that our ability to pass on genes to our children through the process of inheritance has been with us since our creation. Physically, there is only one way to pass on something biological from ourselves to our children. This is called inheritance and involves the replication of DNA sequences of amino acids called genes. Genes are what we inherit from our parents. If this is the case, then what sequence of amino acids would equate to "sin"? Is there also a "meekness" gene which we inherit? How about compassion? The ability to "hear" god speaking, perhaps? Infact, science hypothesises there might very well be certain sequences of amino acids that coorespond to the affects of humanity, although they are yet to be deciphered.

If we inherited original sin from adam and eve then this means we've had the gene for sin as a part of our genetic makeup since our creation, which of course would negate the very idea of original sin. Having the "Sin" gene in us from the get-go disallows the "sinfulness" of disobedience, unless you admit that god set us up to fail. In Logic, this is what is called an argument of Self-contradiction, where the very argument presents two points which cancel each other out. The argument of Self-contradiction is not a valid form of argument.
For argument's sake, however, let's say we do spiritually inherit the sins of our parents through genetics. How then does our spirit or soul survive the death and subsequent decomposition of our physical bodies of which our DNA is the most fundamental part? How could our spirits "go to heaven or hell" after we die if our physical genes are the mechanism of spiritual survival ?
The answer is we did not physically inherit either a soul that is immortal or "sin".
If we did not physically inherit sinfulness, then we must have spiritually inherited it somehow.
If that is the case, then what is the mechanism for this inheritance? It is certainly not DNA, as genetics is physical. Religion offers no explanation for this mechanism. There is no "Religious Method" to counter the Scientific Method of understanding, unless you consider the idea of simply believing what you have been told to believe a method of understanding, i.e. faith.
Curiosity by itself would ask that we try and discover the spiritual mechanism through which these "sinful" attributes are being replicated and passed on to subsequent generations. To date, the only mechanism that we know of that does this exact thing is the DNA in each cell, which is a purely physical entity, requiring no spirituality.
Faith doesn't explain how we inherit the spiritual doom of our parents, it only tells us we do, no explanation needed.
The concept that we "inherited" original sin actually relies on a particular scientific precept, transference, which is also one of the foundations of the theory of evolution.
Attributes are transferred to future generations from previous ones. In evolution these are attributes that are favorable to the survival of the physical being.
Religion perverts this concept into one where the transference does not ensure the survival of the spirit, but the likelihood of its permanent death. "The wages of sin is death", Romans 6:23

If science is not the answer to our questions as religion supposes, then why does religion base its most fundamental precept, the "sin" of which we are all guilty, on the scientifically discovered mechanism of replication and transference, namely DNA?

If on the other hand, we don't inherit our sin, but are given it, by god at the very moment of our birth, then god is a truly malicious being. Adam and Eve sinned and earned god's eternal wrath. We, however, did not. We did not eat of the forbidden tree, we weren't around yet. By the same reasoning, we also did not have any bearing on their commision of original sin.

We, as their descendants, either inherited the problem of sin physically through replication and transference, spiritually through some unknown mechanism that is actually scientific in nature, or god himself bestowed us with this malignancy at the very moment of our births . If god did decide to simply confer on us this spiritual vexation on an entirely individual basis, then he did so knowing the damnation of eternal destruction and torment he was annointing his own creation with. Again, if he did this, he is not a god worth recognizing, let alone worshipping.
Of course, science is the true answer. God is too human, to be anything but.
Religion itself uses science for its own purposes.
Only when science blatantly and completely discredits religion's fantastic claims of the supernatural does it divorce itself from the truth of the scientific method.
This alone is enough to discredit it.