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“IMHO, I no longer consider them Yiddin. I would not use one for a minyan. I won’t eat their shechitah. I don’t trust their kashrus… They are to me, nochrim. Just plain old non Jews.”
Having a crazy shitah does not make somebody a non-jew (and certainly not a “husk of a human being”!). If you would have said you consider them non-frum, we’d have what to talk about; but anybody who is born Jewish stays Jewish. No matter what they have done, no Jew “becomes” a goy.
That said, I once heard a Rov say (only partially in jest) that he would not count an arab-loving NKnik for a minyan, due to the fact that he’s obviously a shoteh…