Question : How is sin transferred from person to another person? Not through birth?
We can not accuse Adam when we see him that he caused all humanities sin. Why because the word says "we all have sinned and have gone astray". We all sin sometime between our birth and death, yes we are the ones that sin (its our sin not anyone's else sin that made us a sinner). Therefore Jesus came to save the world from sin, yes yours and mine ( the sins we individually sinned).
Through one mans sin we all have sinned, not one righteous (through one mans righteousness we are all righteous ).