Interfaith Group

since a large part of the purpose of this group is to find common ground among beliefs, not insult them.

Howsumever, being as how you asked, original sin is generally believed, by most Christians, the sin that Adam committed and which now infects all of humanity, leading to the necessity of salvation through Christ.

Concepts like predestination, the questions of intrinsic or extrinsic evil, even the question of whether or not good can exist without evil to balance it, have been argued since the beginnings of Christianity. Many "heresies" from these early discussions and interpretations of known scripture (unknown is just how much of it was destroyed by early bishops councils) were stomped out in the early days, although that was largely the Romans while the Eastern church, often kept a more open mind about things.

Today, Catholics and yer major Protestant sects generally carry on that basic belief, but there's always Quakers, Anabaptists, and others to kinda get off the track.

Now, if that still doesn't answer your question, please take it back to the Religion group where they have much more fun tearing these ideas apart.