I have a theory that there are three types of sin.
There is the sin against your church/religion’s authority - a Meta sin.
There is the sin that is pointless or patently stupid, so that anyone who will bother going to the pains of avoiding it is obviously a member of Our Tribe - a Shibboleth sin
Then there is what I think of as a Meat Sin. The Meat Sin is defined by a square with a cross drawn in it, making two axes. One axis is the benefits self vs benefits community axis. The other axis is the short term benefit vs long term benefit axis.
Any behavior can be plotted as a point which will fall into one of four quadrants. Behavior that falls in the short term/self quadrant is tempting behavior (call it quadrant one). Behavior that falls in the long term/community quadrant requires thought, planning, and an act of will (call it quadrant four).
An individual is better off, personally, if they avoid quadrant one. Acting for their own long term benefit is better in the long run (hence the phrase - long term benefit). Acting for their community’s benefit, either short or long term, will gain friends and support. Other people are our greatest resource, which makes gaining support good for us, long term.
So it is desirable, from a strictly meat perspective, to shift behavior, especially the behavior of other people, into quadrant four. It tickles me when religions, which are supposed to be based on the spiritual, end up organizing most of their sins from this meat perspective: toting up lists of good and evil behaviors that come down to lists of quadrant four and quadrant one behaviors.
To me, Original Sin is the acknowledgement that all humans, heck, all living things, tend to slide into quadrant one behavior. The Devil is the personification of the slippery slope toward quadrant one. It’s the externalization of the urge to do what you know will not benefit you in the long run, just because it will feel good now.
Original Sin is also the acknowledgement that Life feeds on Life. Life competes with Life. No matter how diligently you plan your behavior, you will never be innocent in the original meaning of the word - - doing no harm. Even plants try to shade out other plants.
We can never be completely innocent. Innocent also has an implied meaning, as in innocent bystander, that is - this person should not be harmed. Like the notion of sacrifice, this implied meaning hinges on a balance. To the degree that someone is harmless, they should not be harmed. Since we can never be completely harmless (due to Original Sin/the general facts of Life), we can also never be completely safe.
Anyone craving Complete Safety will not be worthy of it unless a miracle somehow cancels out their deficit of harmlessness. Only if Someone can magically steal or eat that last bit of unavoidable harmfulness can a person be Completely Safe.
Those of us who can’t find the magic to balance the equation must live with knowing that we are not innocent and we are not safe.