Whiff- the "all" does not refer to all mankind. Paul sometimes uses it to refer only to the community of believers- it is clear that his shift is from the universal "all" to the we-who-are-in-Christ "all." If it was the truly universal "all," then what are we to make of Christ's repeated statements that there WILL be those who reject Him and enter into damnation?
Christ is not blamed for our sins, but in His death He atoned for our sins. If we imagine our sins to be a debt, then Christ is a friend who pays it for us.

