I don't think recognizing false doctrine is a calling. False doctrine and false teachers arise because not enough people will do or say something, not a reflection on anyone in particular just the very notion itself the bible warns on
2Pe 2:1 But false prophets also arose among the people, just as there will be false teachers among you, who will secretly bring in destructive heresies, even denying the Master who bought them, bringing upon themselves swift destruction.
2Pe 2:2 And many will follow their sensuality, and because of them the way of truth will be blasphemed.
2Ti 4:3 For the time will come when they will not endure sound doctrine; but after their own lusts shall they heap to themselves teachers, having itching ears;
2Ti 4:4 And they shall turn away their ears from the truth, and shall be turned unto fables.
Mat 7:15 "Beware of false prophets, who come to you in sheep's clothing but inwardly are ravenous wolves.
We've even discussed UPC preachers preaching false doctrine here