I do not believe that only Catholics will be saved. I believe that all religions are following the same god. Religion is just the way someone chooses to worship that god. The official position of the Catholic Church is, that although, it ‘promotes’ Catholicism and/or Christianity as being the “best way” to go, no one religion holds the monopoly on spiritual truth.
From “Declaration on the Relation of the Church to non-Christian religions”:-
In our time, when day by day mankind is being drawn closer together,
and the ties between different peoples are becoming stronger, the
Church examines more closely her relationship to non-Christian
religions. In her tasks of promoting unity and love among men, indeed
among nations, she considers above all in this declaration what men
have in common and what draws them to fellowship.
Men expect from the various religions answers to the unsolved
riddles of the human condition, which today, even as in former times,
deeply stir the hearts of men: What is man? What is the meaning, the
aim of our life? What is moral good, what sin? Whence suffering and
what purpose does it serve? Which is the road to true happiness?
What are death, judgement and retribution after death? What, finally
is the ultimate inexpressible mystery which encompasses our existence:
whence do we come, and where are we going?
From ancient times down to the present, there is found among
various peoples a certain perception of that hidden power which hovers
over the course of things and over the events of human history; at
times some indeed have come to the recognition of a Supreme Being, or
even of a Father. This perception and recognition penetrates their
lives with a profound religious sense.
The Catholic Church rejects nothing that is true and holy in these
religions. She regards with sincere reverence those ways of conduct
and of life, those precepts and teachings which, though differing in
many aspects from the ones she holds and sets forth, nonetheless often
reflect a ray of that Truth which enlightens all men. Indeed, she
proclaims, and ever must proclaim Christ, “the way the truth, and the
life” (John 14, 6), in whom men may find the fullness of religious
life, in whom God has reconciled all things to Himself.
rc.net/rcchurch/vatican2/nostra.aet