Something is not false simply because someone has labeled it. Labels themselves are often deceptive or misleading. Coca-Cola no longer contains cocaine. The question ultimately is what is the situation now. Generations pass, and old labels often no longer apply truthfully.
Sectarians believe that everything they say is right and everything their opponents say is wrong.
Such a priori reasoning will prove faulty time after time. We embrace a sectarian spirit when at the mention of a name we presume that person is always wrong. Perhaps some introspection of our own attitude is the beginning of understanding why we have become so sectarian towards each other. Let every word be tested by Scripture. Let no man become the final word, as if nothing else need be said.