[brewcrew]

For if there is a just God, it is inconceivable that those who do evil and those who do good have identical fates

This is a false premise. It is possible for some to do evil, some other to do good, and all to be saved. If the the evil-doers come to know God, repent, and are forgiven, they are saved just like those who do good, repent, and are forgiven.

The common thread between them is not the nature of their deeds but the status of their souls. Another way to say it is that the evil-doer and the doer of good both have sin in common.

[Coldwater Creek]

The thief on the cross is a perfect example of what you were saying. Even though he had led a terribly sinful life, as he was hanging on the cross made a profession and Jesus said "this day you will be with me in Paradise".