this stories do not make any sense. If you asked your children not to eat cookies, and you catche them doing so, how upset can you get? Would you be upset for thousands of years, and would you be upset at their children, and your grand children? Of course not. Hence, you and I are better than God, OR the story of Adam and eve is just a stupid story.
The Pentatuch - beginning with Adam and Eve and continuing through Deuteronomy - is the story of the fall of man. This is where we get Original Sin. It comes from the Bible.
Let's see if this can be explained in a better manner.
Original sin was a matter of defying the order of God. But it was not a mere case of defying God, such as you or I do on an everyday basis - it differed in its very nature from everyday sins in that the ones who committed it were created perfect, without stain of sin. It was a pure act of the will against the one commandment by which they had to live. The intent to commit sin, by its very nature, involved a form of rebellion quite unlike the rebellion we commit regularly through our sins. They knew better and had every means of resisting. Their natures were not fallen.
The sin they committed was not merely eating the forbidden fruit, but rather eating the forbidden fruit so that they might "Be as gods" (Genesis 3:5). In committing that act, they put themselves in God's place, choosing their will instead of His.
Original sin is not simply about being punished by God for something that was done long ago. When Adam and Eve committed sin, they radically changed the nature of their relationship with God, the author of life. Death was a direct result of their actions. Sin and rebellion became a part of their natures as well.
Original sin is a terminal disease at sorts on a spiritual level, one that, like many other diseases, is passed on from parent to child.
Personally, I've always considered Original Sin to be one of the parts of Christian doctrine that is most observable in the world around us. Man has a definite tendency towards corruption, and I have yet to meet a man who has not sinned against God in some way. It is a horrible disease that affects every aspect of our life, yet, fortunately, it is also a disease that God provided a cure for by sending His Son to atone for us.
I suggest reading Mere Christianity. C.S. Lewis explains these matters in a way that is much more beautiful than I could ever hope to do.