The Catholic Church teaches that only she possesses the fullness of Truth. ThisTruth has been revealed by God in the Scriptures, the teaching of Our Lord handed down to us by the Apostles and their successors, Tradition and in the natural law which is 'written in all men's hearts'. 
Christ gave the Church the mission to teach all nations this Truth. It is the duty therefore, for Catholics to bring this Truth to the whole world and unite all mankind in Christ's One, Holy, Catholic and Apostolic Church.
The only religion therefore, which has a God-given right to freedom is the Catholic religion. It exists in a world which, alas, has not fully turned to Christ. Nevertheless it has the right to proclaim the Truth anywhere whether non-Catholics agree with it or not and the duty to resist and secular laws which might force its adherents to commit sin. And it has this right because as I said above, it alone possesses the fullness of Truth.