Just a few thoughts over morning coffee from someone with no particular connection to Christianity.
Do we not inherit guilt in much the same way that we inherit other human characteristics? We simply are the kind of creatures who do guilt. Here’s one definition of guilt I’ve picked off the web: ‘a self-conscious emotion that involves negative evaluations of the self, feelings of distress, and feelings of failure’.
Guilt arises in in dependence on having the kind of brain that generates self-consciousness and it’s sequelae. Biblically, the sin we are guilty of is that of eating the fruit of the tree of knowledge of good and evil. This is also something that arises from self-consciousness. Feeling ourselves separate beings with interests we see things as good or bad for us. We imagine the world on our own terms - or to put it more bluntly, it’s all about us.
My guess is that this is more or less what the Genesis story is trying to convey, along with the idea that transferring our centre of moral gravity to something bigger than ourselves - God - might constitute a remedial act, helping us to get out of our own way. Thus we are ‘saved’ from at least some of the damage we inadvertently inflict on ourselves and others because we are this kind of creature, inheriting these kinds of psychological issues.
The alternative is to remain psychologically atomised in a world of other over which we have little control, a generally quite frightening, even hellish, experience. Other religions and philosophies attempt to deal with the collateral damage of self-consciousness via different stories but the basic idea is usually much the same, I think. Of course, people do often interpret such ancient myths in ways that simply add to our woes but that’s also something we inherit as humans, the tendency to fuck everything up.