Let's see some references, please.
Before Vatican II, the Church consistently taught that only Roman Catholics had a chance to be saved and attain Heaven. Followers of other Christian denominations and of other religions would be automatically routed to Hell for all eternity:
* Pope Innocent III (circa 1160 - 1216 CE) is considered “one of the greatest popes of the Middle Ages...” 1 At the Fourth Lateran Council (a.k.a. the General Council of Lateran, and the Great Council) he wrote:
“There is but one universal Church of the faithful, outside of which no one at all can be saved.”
* Pope Boniface VIII (1235-1303 CE) promulgated a Papal Bull in 1302 CE titled Unam Sanctam (One Holy). He wrote, in part:
“Urged by faith, we are obliged to believe and to maintain that the Church is one, holy, catholic, and also apostolic. We believe in her firmly and we confess with simplicity that outside of her there is neither salvation nor the remission of sins...In her then is one Lord, one faith, one baptism [Ephesians 4:5]. There had been at the time of the deluge only one ark of Noah, prefiguring the one Church, which ark, having been finished to a single cubit, had only one pilot and guide, i.e., Noah, and we read that, outside of this ark, all that subsisted on the earth was destroyed....Furthermore, we declare, we proclaim, we define that it is absolutely necessary for salvation that every human creature be subject to the Roman Pontiff.” 2
The last sentence in the original Latin reads: “Porro subesse Romano Pontifici omni humanae creaturae declaramus, dicimus, definimus, et pronuntiamus omnino esse de necessitate salutis.” 3
* Pope Eugene IV, (1388-1447 CE) wrote a Papal bull in 1441 CE titled Cantate Domino. One paragraph reads:
“It [the Church] firmly believes, professes, and proclaims that those not living within the Catholic Church, not only pagans, but also Jews and heretics and schismatics cannot become participants in eternal life, but will depart ‘into everlasting fire which was prepared for the devil and his angels’ [Matt. 25:41], unless before the end of life the same have been added to the flock; and that the unity of the ecclesiastical body is so strong that only to those remaining in it are the sacraments of the Church of benefit for salvation, and do fastings, almsgiving, and other functions of piety and exercises of Christian service produce eternal reward, and that no one, whatever almsgiving he has practiced, even if he has shed blood for the name of Christ, can be saved, unless he has remained in the bosom and unity of the Catholic Church.” 4
It couldn't be more clear.