Brothers, I beg you to be on the watch against those who cause dissension and scandal, contrary to the teaching you have received. Avoid their company. There is another foolproof method of discerning a person and their teachings. This method has stood the test of time. It is a perfect way to begin the discernment process for any Catholic, and it very simple.
Angelic spirits are smart.
God made them that way, but don't forget, God is the creator and they are merely creatures. Satan knows that the Bible says his two greatest enemies are Mary and the Pope. Being as this will bring satan pain, you can bet that those who are in league with satan will not be fans of Mary and the Holy Father. We are not talking about our separated brothers and sisters of other denominations who have by culture and circumstances never come to know this truth. We are talking about Catholics.