Did Vatican II intend to defy and nullify the Book of John and the salvation value of the Sacraments?
Definitely not. Vatican II, Lumen Gentium, 14 teaches:
“Hence they could not be saved who, knowing that the Catholic Church was founded as necessary by God through Christ, would refuse either to enter it, or to remain in it.”
Christ’s Church knew from the beginning that non-Catholics could be saved:
Pope St Clement knew that non-Catholics could be saved from the beginning, for he wrote in about 95 A.D. to the Church in Corinth: “Those who repented for their sins, appeased God in praying and received, salvation even though they were aliens to God.” Catholic Apologetics Today, 1986, Fr William G Most, p 145].
This is the reality:
“By Faith it is to be firmly held that outside the Apostolic Roman Church none can achieve salvation. This is the only ark of salvation. He who does not enter into it will perish in the flood. Nevertheless, equally certainly it is to be held that those who suffer from invincible ignorance of the true religion, are not for this reason guilty in the eyes of the Lord. Now, then, who could presume in himself an ability to set the boundaries of such ignorance, taking into consideration the natural differences of peoples, land, native talents, and so many other factors” (Pope Pius IX, Singulari Quidem, 1863 A.D.).[My emphasis].
The use of that phrase was as Saint John Paul II explains in *Threshold of Hope *(Random House, 1994, p 140-1):
“Besides formal membership in the Church, the sphere of salvation can also include other forms of relation to the Church. Paul VI expressed this same teaching in his first encyclical, Ecclesiam Suam, when he spoke of the various circles of the dialogue of salvation (Cf. p 101-117), which are the same as those indicated by the Council as the spheres of membership in and of relation to the Church. This is the authentic meaning of the well-known statement ‘Outside the Church there is no salvation.’ ”
However an individual is saved, it is only through Christ’s Catholic Church, whether they know that or not.