Well, I'm not a "present day Protestant." I do not protest the Roman Church. Furthermore, I think identifying the papacy with one of the beasts of Revelation and the Church of Rome with the "great harlot" of Revelation is absolute baloney—merely an indication of the hatred of the first Protestants against the Catholics of the day. I neither support the Catholics nor the Protestants who lived in the days of the Protestant Revolution. Today's Catholics have changed for the better. So have some of the Protestants.If a present day Protestant believed as the Reformation saints and martyrs ... that the papacy was one of the beasts of Revelation, and that the Church of Rome was that great harlot church that had reigned over kings of the earth ... it should not be difficult for a serious student of prophecy to recognize the identifying mark of the beast on RIGHT hand and/or FOREHEAD of it’s followers. Rev 13:16
Also, there's no indication in the book of Revelation that the harlot was, or would be, a church.