Romans 4: 15 Because the law worketh wrath; for where no law is, there is no transgression.
Romans 5: 19 For as by one man's disobedience many were made sinners,
Romans 7: 7 What shall we say then? Is the law sin? God forbid. Nay, I had not known sin but by the law; for I had not known coveting except the law had said, Thou shall not covet.
Romans 2: 14-15 For when the Gentiles, who have not the law, do by nature the things contained in the law, these, having not the law, are a law unto themselves; Who show the work of the law written in their hearts, their conscience also bearing witness, and their thoughts the meanwhile accusing or else excusing one another
Adam and Eve were created without sin. When they ate from the tree of the knowledge of good and evil, they acquired this knowledge ( which is called our conscience). As the first man and woman, they passed this knowledge unto their descendants so that we are all born under the law of conscience. Even Jesus was born under this law of conscience (except that he never sinned). The problem with humanity is that our motivation for living is self. If "total depravity" means totally evil, then calvanists are wrong. If "total depravity" means that we are all born under the law of conscience with "self" as being our motivation for living, then we cannot please God, are all condemned, and the calvanists are correct.