How was Our Lord “made to be sin”?

How could God have made Our Lord “to be sin?” (2 Corinthians 5:21)

How could God have made Our Lord “to be sin?” (2 Corinthians 5:21)

Was St. John the Baptist born without Original Sin? This topic came up at a recent weekly meeting of our Catholic Study Group.

Wherein two Doctors of the Church speculate that the cross of Our Lord was a trap set for the devil.