Perhaps another analogy is between Roman Catholics, who don't really follow the Bible but tradition of the "Church Fathers", and who have shed such bloodshed in history, and which Adventists claim are not "real Christians" (or at least their leaders who are literally anti-Christ), just as Catholics claim to speak for all of Christianity...

AND

"Haddith-Muslims", which claim to follow the Qu'ran but really follow the traditions of the Haddith, who have likewise shed much bloodshed in history, and which "Messianic-Muslims" would claim are not "real Muslims" just as most Muslims would consider Messianic-Muslims apostates.