Here is another take on it:
This objection reveals the sinister and ungodly nature of the original sin dogma. What does this objection imply? It implies that it would be criminal, wicked, and sinful for anyone to live a life without sin. It implies that men ought to be born with a sinful nature, lest it be possible for someone to live a life without sin! It implies that God wants men to be depraved sinners, that he wants them to be born with a sinful nature so that he can have the honor and glory of saving them. It implies that it would be impudence, arrogant pride, and high treason against God to live a life in humble obedience to God and never rebel against him. It implies that God would be insulted and dishonored if someone obeyed God all his life and never sinned against him. It implies that to please and glorify God we must be forced to displease and dishonor him. In a word, it implies that it would be sinful to be free to obey God. And why? Because if we were free to obey God, someone might do it and would not need to be saved. What logic!
But this is an example of the type of reasoning that must be resorted to in order to defend the dogma of original sin. But we have already seen that if men are not free, and if they sin by a necessity of their nature, they cannot be responsible for their actions and their actions cannot have moral character anymore than a gun that is used to commit murder can have moral character. What? A man who must sin necessarily because of an inherited sin nature responsible and guilty for what he cannot avoid? If it were true that we were born with a nature that deprived us of the liberty and ability to obey God (which is the doctrine of Augustine and original sin), if it were true that we were born with a nature that made us disobey God, and if it were true that we were created by God under a law that made us by nature sinners and rebels, we could never in justice be blamed or punished for our sins. If we were unable by nature to obey God, sin would not be a crime, but rather a calamity. Words in the Bible like pardon and mercy would have no meaning. God would be cruel and a tyrant for condemning the unfortunate sinner to hell for what he could not avoid. The offer of mercy and pardon to the sinner would be an insult. The truth is that the doctrine of natural inability to obey God makes all the doctrines of the Bible absurd and irrational.
But the objection we are considering both assumes and demands that men be born with the natural inability to obey God, and it imputes the onus of pride, self-righteousness, and even the despising of God's gracious plan of salvation to the person who will not swallow all the absurdities of the original sin dogma. One form of this objection is put in the following insinuating question: "So you think that a person is able to live his whole life without sinning and that he can be saved by his good works?" But the stigma of pride and self-righteousness does not belong to the one who rejects the dogma of original sin, for to recognize and admit that one is the author of his own sins, that he is guilty for them, and that he is worthy of being sent to hell for them is not self-righteousness, nor is it despising God's gracious plan of salvation. It is just the opposite. It is humbling one's self in view of the guilt of one's sins, and it is acknowledging one's need of God's mercy and salvation in view of one's deserved punishment for his sins.
How ridiculous and absurd, then, is the objection that "men cannot be free and able to obey God, because if they were able, there would always be the possibility that someone might do it and would not need to be saved"! How foolish is the notion that God would be insulted, profoundly humiliated, and his government subverted and overturned if men could and did obey him! What supreme foolishness is the objection that "Someone might possibly live his whole life without sin." What! Would it really be a sin to not sin? Would it be wicked to be free and have the ability to obey God? Would God be insulted, dishonored, and confounded if someone in his kingdom lived all his life without sinning against him? Would he consider it a catastrophe of the first magnitude if someone actually did love and obey him perfectly from the cradle to the grave? It is impossible! God does not have that kind of character.
http://www.gospeltruth.net/menbornsinners/mbs05.htm