The etymological meaning of Lucifer is “bearer of light,” making Luciferians consequently the bearers of light and thus of the truth.
Also, last I checked, Protestantism has its origins in the 16th century, before which time, Christians were almost universally Catholic or Orthodox, and it is they who invented the rule that all true doctrine must come from the Bible (note that that rule isn’t anywhere in the Bible…). Talk about changing the rules, huh?
Before the Catholic church, there was no all-encompassing institution that governed the individual churches. 2 Timothy 3:16 also set the standard for living by the scriptures.
EDIT: Just so you know, I have no loyalty to the protestant churches. I don’t think that an individual church should be very big. The bigger, the more corrupt.
I can’t remember exactly what you’re religious beliefs are. Could you remind me?