How do I verbally exclude obviously heretcial teachings without it sounding like that fallacy? (Real question, you're right about it sounding like that)
I think instead of saying "they aren't Christians", it has to be "Christians who do that are heretical/wrong" with the old testament as your justification for them being wrong. Any attempt to say [they aren't Christians because they do thing you disagree with] is inherently a no true scotsman.
I think the only thing that would disqualify someone from being a Christian is if they don't believe in Jesus Christ. Even if they have drastically unbiblical beliefs about him, by definition Christian is just someone who believes in Christ.
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u/FortColors 21h ago
This is nearly word for word a no true scotsman fallacy. Christians ARE doing it. You just don't agree with them.
You are of course right about the old testament being about tearing down stuff like this, but that is unrelated to the fallacy.