Pope Gregory Fiercely Rebukes Jorge Bergoglio's Religious Indifference As "Evils" and "The Fraud Of The Wicked"
'from' Pope Gregory's Encyclical, Mirari Vos
"13. Now We consider another abundant source of the evils with which the Church is afflicted at present: indifferentism. This perverse opinion is spread on all sides by the fraud of the wicked who claim that it is possible to obtain the eternal salvation of the soul by the profession of any kind of religion, as long as morality is maintained. Surely, in so clear a matter, you will drive this deadly error far from the people committed to your care. With the admonition of the apostle that “there is one God, one faith, one baptism” may those fear who contrive the notion that the safe harbor of salvation is open to persons of any religion whatever. They should consider the testimony of Christ Himself that “those who are not with Christ are against Him,” and that they disperse unhappily who do not gather with Him. Therefore “without a doubt, they will perish forever, unless they hold the Catholic faith whole and inviolate.”
Francis preached to worshippers within one of Muhammad's Mosques in Africa, "Christians and Muslims are brothers and sisters". (Doukoudou Mosque2015)