I agree with you re: antipopes, but I don't think it applies too well to how "Antichrist" is used in the Bible, which definitely is in a "good vs. evil" sense. Small-a "antichrists" is a somewhat generic descriptor used in 1 John 2 (one of the criterion being that they "[deny] that Jesus is the Christ"), and so it seems to refer to those who actively oppose Christ.
Separately, that passage also refers to "the antichrist" (emphasis mine), who is traditionally identified w/ the "man of lawlessness" in 2 Thessalonians 2 and the "beast" in Revelation. And this figure is pretty unambiguously evil ("man of lawlessness"; "son of destruction"; makes himself out to be God; violently persecutes Christians; makes people have to worship him if they want to buy or sell anything; etc.)—even by secular standards, he's a megalomaniacal despot.
That's interesting. Thanks for the correction and for sharing.
So if I understand this correctly, there's basically both concepts? One is an unambiguously evil figure, while the other is essentially a definition for anyone who denys that Jesus is Christ, even if their ideological differences are begign?
Sorry, this gets into a fuzzy realm that might not be useful beyond just wild conjecture: it gets me thinking about the possible intent to create a sort of strawman. Create a megalomaniacal bogeyman and align to it anyone who doesn't toe the Church's line? I don't mean to be offensive or critical and I'm sure there's a term for this sort of meta theology (or is it just theology?) where I'm fascinated by what might have been the intent of these stories as curated for generations by a historically dominant power structure?