There is a crack... in everything. That's how the light gets in.

[qazplm135]

50. it's pretty literally laid out in the bible

that original sin is literally the moment when Eve (and Adam) defies God and eats of the Fruit of the Tree of Knowledge of Good and Evil.

It's literally defiance of God, specific defiance, with a specific act.

"Original sin, also called ancestral sin,[1] is a Christian belief of the state of sin in which humanity exists since the fall of man, stemming from Adam and Eve's rebellion in Eden, namely the sin of disobedience in consuming the forbidden fruit from the tree of the knowledge of good and evil."

https://en.wikipedia.org/wiki/Original_sin#cite_ref-FOOTNOTEODCC2005Original_sin_2-0

It's...literally...the "original" "sin." As in the first sin. Mankind shares that sin in a weird inheritance that renders a newborn infant as having the "stain" of the sin of Adam and Eve.

Augustine described it as "inherited guilt."

Martin Luther says similar things. Mary was a special case without sin so she could birth Jesus.

There are competing theories within Christianity, so at best one can say your argument that it's "imperfection" is picking one of those theories and applying it to the whole.