But "heresy" is a moving target, no? What if a certain heresy gathers steam and eventually becomes 51% popular? What about 25% popular? I remember we used to wear it as a badge of honor (in my UPC days, the 80s) that author researcher Walter Martin officially labeled us a Cult.
BTW, (only since he's prominent at the moment,) Harold Camping believes Hell is simply permanent anihilation of consciouness, not eternal torment.
The WORST part of adopting any "heresy" is to later notice who your bedfellows are!!
Everyone's a heretic to someone!
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Hebrews 13:23 Know ye that our brother Timothy is set at liberty