异端: belief or opinion contrary to orthodox religious doctrine – Oxford English dictionary.
From the 定义, you can see 异端 is depended on orthodoxy. To define 异端, you need to define orthodoxy. orthodoxy is the reference point for 异端. So
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To Catholicism, Protestantism is 异端.
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To Protestantism, Catholicism is 异端.
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To Lutheranism, Calvinism is 异端.
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To Baptist’s Sacramental Theology, Lutheran’s Sacramental Theology is 异端.
So on, so forth.
Calling someone 异端 without defining orthodoxy is no different than calling someone illegal without referring which law he/she is breaking.
There’s a saying:
“Called as异端 by nondenominational Christian is no difference than called as “traitor”by internationalist (someone not able (or unwilling) to define a border).
So instead of calling each other 异端 all the time, why don’t you guys get together to define what’s orthodoxy?
If Protestantism history of the past 400 years is of any guide…, you will know the answer to my suggestion:))
nngzh, Are you still interested the Catholic Definition of Heresy? I can certainly give the Definition. But why do you care what the catholic church teaches?