Tom, even his premise is wrong:

Quote
With this matter of guilt, however, just as with the imputation of Christ's righteousness, there must be some conscious and voluntary decision on our part. Until this is the case, there is only a conditional imputation of guilt. Thus, there is no condemnation until one reaches the age of responsibility.

Where does the Bible teach conditional imputation of guilt (Rom 2:12; Rom 5:12-21; 1 Cor 15:21)--referring to the Fall, etc? Where does Erickson deal with the pollution of sin? This IS NOT Reformed Theology!!!

Did all sin in Adam? As Ferggy says,

Quote
"In Adam's fall we sinned all." By his disobedience we have all been constituted sinners (Rom. 5:19). As a result of our natural relationship with him we have come to share in his depravity from the very beginning of our existence. We are flawed from conception. None of us has a "normal" birth.

Reformed and Always Reforming,