This new orientation, that claims that non-Catholics need not convert because they are “in some mysterious way “part of the Church of Christ, defies the Churches perennial teaching on the necessity of non-Catholics to abandon their errors and return to the one true Church of Jesus Christ, as was summed up in Pius XII’s 1949 Instruction on the Ecumenical Movement:
“True reunion can only come about by the return of dissidents to the the one true Church of Christ the Catholic Church.”
Further, this refusal to combat heresy particularly the heresy of Protestantism, brings to mind the words of the renowned 19th Century writer, Father Frederick Faber, who said, “Where there is no hatred of heresy, there is no holiness. “
From the book: The Revelations of the Holy Face of Jesus by John Vennari
Reality Meets Faith 