They hear a man repeating the creeds. He seems to be repeating them with the utmost fervor. He is particularly fervent in expressing his belief in the deity of Christ. They simply assume that he means by the deity of Christ what people have always meant by it. So they tolerate him in the Church and put him in a position of authority.
Time goes on.
Many such men are put into positions of greater and greater authority. They undermine the faith of the Church, partly by their words, but more particularly by their silence. A deadly vagueness gradually affects the Church's witness. The young people of the Church are not soundly indoctrinated. People do not know what is wrong, but the Church loses its power.