No, actually they never were. This, for instance, is irrefutable: Protestantism is a 16th century heresy. Protestant sects are a 16th century creation. That simply cannot be denied. It cannot be refuted.
Heresy compared to what?
Compared to a corrupt Church which had all but entirely destroyed Christianity in the West, having slip-n-slide subtle change and addition morphed it into something yet else.
You are the one who is illogical, vladi. You still lose, and will keep losing.