Adam was created by God, not born of God. God only has one Child, Jesus! The brothers and sisters of Christ are those that are born again and adopted into his family throught the cleansing blood of Jesus.
If God recreated the world PERFECTLY, with no sin, disease, or chance of death, and put anyone and their chosen spouse there with their current nature (personality, opinions, vices, etc.), and they had children, how long would it that world remain perfect?
How do you think we got to our current state? The scenario above is exactly what happened to Adam and whats-her-name.
If God had made Adam where he could not choose to go his own way, we all would simply be automatons, mere robots without free will. God wanted his creation to choose to love him, not be forced to. Thus free will, sin, condemnation, and redemption.
"My feelings as a Christian points me to my Lord and Savior as a fighter. It points me to the man who once in loneliness, surrounded by a few followers, recognized these Jews for what they were and summoned men to fight against them and who, God's truth! was greatest not as a sufferer but as a fighter. In boundless love as a Christian and as a man I read through the passage which tells us how the Lord at last rose in His might and seized the scourge to drive out of the Temple the brood of vipers and adders."
--Adolf Hitler, in a speech on 12 April 1922 (Norman H. Baynes, ed. The Speeches of Adolf Hitler, April 1922-August 1939, Vol. 1 of 2, pp. 19-20, Oxford University Press, 1942)
--http://answers.yahoo.com/question/ index?qid=20080202184940AAmXGfl