I can't agree very much with the other postings. If you read the words of God at the close of the Eden cycle, God doesn't say that Adam created human sin. The Greek Orthodox tradition says Adam and Eve were the First to have sinned.... rather than the idea that Adam's sin has been "locked into" all humanity.
And the reason they had to leave Eden was not because sin wouldn't be tolerated, but because God was not going to let Adam and Eve "be as Gods" eating from the Tree of Life and knowing Good from Evil. It's right there in Genesis 3!:
And the LORD God said, Behold, the man is become as one of us, to know good and evil: and now, lest he put forth his hand, and take also of the tree of life, and eat, and live for ever:
Therefore the LORD God sent him forth from the garden of Eden, to till the ground from whence he was taken.
So he drove out the man; and he placed at the east of the garden of Eden Cherubims, and a flaming sword which turned every way, to keep the way of the tree of life
God made humans to be mortal... not as Gods. And with mortality is imperfection. The one thing God would not tolerate is allowing imperfection to become immortal !
I am inclined to think how poorly we understand God's view of what "sin" is.
Do you know the very first time the word "sin" appears in the Hebrew writings? It doesn't appear in the chapter where Adam and Eve supposedly gave birth to sin. It appears in the next chapter, when God is explaining to a saddened Cain what "sin" is:
And in process of time it came to pass, that Cain [the farming son] brought of the fruit of the ground an offering unto the LORD.
And Abel, he also brought of the firstlings of his flock and of the fat thereof. And the LORD had respect unto Abel and to his offering:
But unto Cain and to his offering he had not respect. And Cain was very wroth, and his countenance fell.
And the LORD said unto Cain, Why art thou wroth? and why is thy countenance fallen?
If thou doest well, shalt thou not be accepted? and if thou doest not well, sin lieth at the door. And unto thee shall be his desire, and thou shalt rule over him.
And so the first thing called Sin by God is not an immoral choice.... but a flawed choice. The choice of bringing plant offerings to God instead of blood offerings. And as you will see below, the Hebrew term for Sin is used almost as much for the "sin atonement" as for the thing that triggers the need for atonement!
Strong's Hebrew word #2403: chatta'ath
Pronunciation: khat·tä·ä' (Key)
Root Word (Etymology) From חָטָא (H2398)
KJV Translation Count — Total: 296 times in the Old Testament.
The KJV translates Strong's H2403 in the following manner:
sin offering (116x),
purification for sin (2x),