I don’t understand how it can be a mortal sin. One of the requirements for mortal sin is that the Christian must KNOW that it is a sin. A priest who is teaching error is not aware that his teaching is error; he believes it to be the truth and that everyone ELSE is teaching error.
OTOH, there is that extremely condemning passage in Jeremiah 23:1 “Woe to the shepherds who are destroying and scattering the sheep of my pasture!” declares the Lord. This doesn’t sound like the Lord God tolerates clerics who lead people astray. But is the passage talking about teaching wrong theology, or is it talking about clerics who lead people into sin such as idolatry, sex sins, criminality, etc.?
Perhaps the mortal sin happens when the priest first makes the decision to go against what the Church teaches. However, many people, including priests, have a difficult time understanding exactly what the Church teaches.
Again, I’m not seeing how this can be a mortal sin because of the lack of understanding.
Perhaps someone could explain this? Thanks.