You misunderstand the question.
If God predestined man to sin, could he not also predestine man to leave the garden? And if so, why put angels at the entrance of the garden to prevent man from going back in if man cannot go back regardless because God predestined him to leave and never come back?
Why, if Calvinism is the correct way of interpreting the Bible, does the Bible say:
"Then the Lord God said, “Behold, the man has become like one of Us, to know good and evil. And now,
lest he put out his hand and take also of the tree of life, and eat, and live forever”— *
therefore the Lord God sent him out of the garden of Eden to till the ground from which he was taken." - Genesis 3:22-23
http://www.biblegateway.com/passage/?search=Genesis3:22-23&version=NKJV
Why does God state there is a possibility of Adam returning to eat if God predestined Him not to return at all? That contradicts predestination.
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