I should have stated that my only reason for believing that more died at the hands of "Catholics" than "Protestants" is that the "Catholics" have been around longer. I tend to disount these murders because I don't believe that true Christians -- either Catholic or Protestant -- committed them. The murderers were wolves masquerading as sheep and I'm not going to blame the sheep or the shepherd for something that the wolves did.
You're correct. The Apostolic and Catholic Faith dates to the Upper Room, circa 33 A.D. Protestantism dates to the sixteenth century.