why stop there?
what about if a person believes animals have no souls? damned?
or what about someone who thinks wine in the Bible has no alcohol content? condemned?
how about people who celebrate christmas or easter or mother's day? forsaken by God?
if being in some sort of error voids salvation, maybe we are too casual by refusing to excommunicate for every tiny mistake.
also to me it doesn't make sense Jesus would say He "never" knew them if the truth is that He did in fact know them, then stopped knowing them later. one would expect the text to say "depart from Me, I used to know you"
His ways are higher than mine, tho. for sure i won't argue with Him.