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Although I agree your comment is a solid rejoined to Heartbreaker's oversimplification of medieval understanding of original sin and its effects, may I suggest an amendment?

Indeed the concept of original sin as we have inherited it, is largely coined by Augustine building on Paul's explanation of salvation through Jesus as the New Adam. And indeed the evils of "sickness, suffering, and death" can no longer be attributed to original sin in any way for precisely the reason you give--we acquired those "evils" as intrinsic to our biological nature evolved from the very earliest form of life. And indeed, in Catholic parlance, "original sin never occurred" is a reasonable way to express that.

Nonetheless, I suggest there is an altered understanding of the tradition of original sin that expresses something very true about our human existence. In a very real sense, we do come into this world immersed in "inherited evil;" and I think there are two ways in which this is true.