This story has been SO misused and reinterpreted by liberal Christians over modern times - it has even managed to infect those evangelicals whose biblical exegesis is somewhat below par.Reverend Creech, at least gets the perspective right. It is my belief that the woman was part of the plot itself.
Also, he might perhaps have pointed the nature of the trap a little better - Jesus was being invited to reject the Law or defy the Romans by authorising an execution.
What exactly was she forgiven for - without any signs of repentance?
It is difficult to see that it was in fact adultery in the absence of the male party - without whom the whole shebang was more than a little staged and farcical.
However you take it - the liberal constructs and additions are logically untenable.