..."What you quote that your are objecting to is called "original sin"."...

Time we re-think our  concepts based on a misreading of Scripture! If we now accept that God inspired the author(s) of the Creation stories to write  'myth', then there never was an actual, real, historical 'Adam and Eve'; nor any 'sin' of non-existent people  in the first place.

Even IN the myth, 'Adam and Eve' are pictured as quite capable of sinning by disobeying God's command. Not much difference between 'original nature' and 'fallen nature'.