Are you asking this question because you are UNAWARE that is has been asnwered earlier in this thread, or do you just not LIKE the answer that ws given earlier?
Here it is again: Post 153 Romans 1 teaches plainly that all men can know certain things about God and His character from nature, and that those things are plain, evident and unmistakeable. The problem with those who "never heard of Christ" is the same problem with those who HAVE heard of Christ...., we don't like the idea of being eternally accountable. The scripture teaches that we deliberately suppress the innate (built in) and extant (available for viewing) evidence for a holy creator God, whether it is some Hotentot in S. Africa or some modern American who has an abundannce of knowledge available.
Those who "have never even heard of Jesus Christ" have light like a weak flashlight. Those who hear the good news of Christ's death for sinners are like those standing in Madison Square Garden before a bank of Hi intensity lights. Men are not judged on HOW MUCH light they have, but WHAT THEY DO with the light they have.
The testimony of scripture and experience is that men universally turn away from the true God, and either worship themselves, their pleasures, or false religions.
THAT is what men are judged for (See Romans 1-2 for a more detailed explanation)
By answering the question directly? I guess you didn't follow the link, so I'll cut and paste it for you.
"Outside the Church there is no salvation"I don't know how to make my (the Church's) answer any clearer.846 How are we to understand this affirmation, often repeated by the Church Fathers?335 Re-formulated positively, it means that all salvation comes from Christ the Head through the Church which is his Body:
Basing itself on Scripture and Tradition, the Council teaches that the Church, a pilgrim now on earth, is necessary for salvation: the one Christ is the mediator and the way of salvation; he is present to us in his body which is the Church. He himself explicitly asserted the necessity of faith and Baptism, and thereby affirmed at the same time the necessity of the Church which men enter through Baptism as through a door. 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.336847 This affirmation is not aimed at those who, through no fault of their own, do not know Christ and his Church:Those who, through no fault of their own, do not know the Gospel of Christ or his Church, but who nevertheless seek God with a sincere heart, and, moved by grace, try in their actions to do his will as they know it through the dictates of their conscience - those too may achieve eternal salvation.337848 "Although in ways known to himself God can lead those who, through no fault of their own, are ignorant of the Gospel, to that faith without which it is impossible to please him, the Church still has the obligation and also the sacred right to evangelize all men."338