In case you missed this over there, imonk recently published a response from Baptist scholar Dr. Timothy George to the question "How can Baptists respond to Catholic and Orthodox Christians who challenge our view of the Lord's Supper as having no deeper historical/Biblical roots than Zwingli?"
(Zwingli was a contemporary of Martin Luther, d. 1531.)
This is a pretty brief read, but definitely educational. Check it out.
My understanding is that Dr. George's answer to the question is basically: 'Baptists need to change their view... then they can worry about what others are saying.' He and I are absolutely on the same page here.