I can think of so many issues that divide us Christians today that would just fade away into the mists of time if we could just get back and start over as if we were the 1st century Jesus movement.  Isn't that a good definition of the Sacrament of Reconciliation?  

That doesn't mean we forget or ignore our history, but rather learn from and live ABOVE that sordid and bloody history.  Hans Kung has already given us a good place to start:

-  Martin Luther's rehabilitation,
-  Lifting all the excommunications that were pronounced in the Reformation era,
-  Recognizing Protestant and Anglican ministries,
-  Mutual Eucharistic hospitality.

Make it so.  Engage!