Greeetings Robert,
Cool Thread!
I agree with your opening post almost entirely. There is just one point I'd differ with you on and that this....
"For as by one man disobedience many were MADE sinners" Romans 5:19.
We inherited sin from our first Father Adam. We all have Adam's blood coursing through our veins. This means that the God of Calvinism is unjust because he sends sinners to hell. No one should be sentenced to hell because they are sinners. No one will go to hell because of sin, they will go to hell because of unbelief and rejection of God's Son, Jesus Christ.
The part I put in bold is only correct from a certain perspective, in sort of a semantic way. People are Hell bound because of sin but not because of Adam's sin but because of their own. The solution to "original sin" is found right in the passage from which you quoted...
Romans 5:18 Therefore, as through one man’s offense judgment came to all men, resulting in condemnation, even so through one Man’s righteous act the free gift came to all men, resulting in justification of life. 19 For as by one man’s disobedience many were made sinners, so also by one Man’s obedience many will be made righteous.
Further Ezekiel 18 (the whole chapter) destroys the notion that God ever intended to punish anyone for sins that were not their own.
Having said that, I agree entirely with the point you're making which is that God is just and that if we have a doctrine that teaches that God does things that are unjust we need not fix the word "justice" but rather we need to fix our doctrine.
Resting in Him,
Clete