Sure thing brother.
The term “original sin” deals with Adam’s sin of disobedience in eating from the Tree of Knowledge of Good and Evil and its effects upon the rest of the human race.
The doctrine of original sin focuses particularly on its effects on our nature and our standing before God, even before we are old enough to commit conscious sin.
The act itself comes from "imputation".
Romans 5:12–13 (ESV)
12 Therefore, just as sin came into the world through one man, and death through sin, and so death spread to all men because all sinned— 13 for sin indeed was in the world before the law was given, but sin is not counted where there is no ...
This was made possible by the fact that Adam was the "Federal Headship" of all humanity. In other words, what He did as our leader then, affected all the actions of humanity from then to now.
Adam’s sin has resulted in the rest of mankind inheriting a propensity to sin, commonly referred to as having a “sin nature.” This sin nature causes us to sin in the same way that a cat’s nature causes it to meow—it comes naturally. According to this view, man cannot stop sinning on his own; that is why God gives a universal grace to all to enable us to stop.
Not only was Adam found guilty because he sinned, but his guilt and his punishment (death) belongs to us as well (
Romans 5:12,
19). There are two views as to why Adam’s guilt should be seen by God as also belonging to us. The first view states that the human race was within Adam in seed form; thus when Adam sinned, we sinned in him. This is similar to the biblical teaching that Levi (a descendant of Abraham) paid tithes to Melchizedek in Abraham (
Genesis 14:20;
Hebrews 7:4-9), even though Levi was not born until hundreds of years later. The other main view is that Adam served as our representative and so, when he sinned, we were found guilty as well.(Federal headship).