I am Catholic and I am sorry other Catholics said that. What they said is not, of course, a correct statement of the position of the Catholic Church. Indeed, it is the opposite.
"Outside the Church there is no salvation"
846 How are we to understand this affirmation, often repeated by the Church Fathers? 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.
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I suppose that what the Catechism is telling me here is that, since I most assuredly do not believe that the Roman Catholic Church was "founded as necessary by God through Christ," my "refusal" to "enter it" does not work to deprive me of my salvation? Do I have that right?
We are saved by grace alone, through faith alone, in Christ alone.