I might pipe in here and say that I do get offended when someone tries to tell me what I or the Church believes. Either they’ve heard it from someone disgruntled and has left the Church or from someone who knows nothing abt Catholicism anyway.
I myself have a great deal of compassion for those involved with that facet of our culture of death. There are doctors, nurses, admin people, the whole bunch…the fullness of truth is held within the Catholic Church from the time of the Early Church Fathers. So that is a good place to start your search for where possibly our truth comes from. It comes from the succession of the Popes from the time of Peter as our first.
There is nothing to be said for tolerance in my mind that upholds immoral or sinful behavior as someone else points out. While I am a Christian, I am called actually to dislike the things the Lord himself has distaste for, and that would be a violation of life from the time of Cain and Abel. There are things the Lord hates, he always loves us, but sin he does not tolerate. I think it is an instrument of the devil to believe that things such as these should be tolerated. It is our politically correctness that desires tolerance so that we should put up with these affronts to our Lord. I am not suggesting persecuting them, that is God’s ultimate job, but I don’t need to say it is good. The job of the devil, the enemy, is to take things that are sinful and paint them as harmless or benign. Many people in our passionate quest to be heard can seem intolerant, when we are just trying to get through.
I should and do love my fellow brother, but it is also my job as a Christian to point out their lacking so as to enable them to grow in faith and goodness. If I do not admonish them, then I become complicit in their sin.
I hope that was useful…think you got off on one topic and stayed while your question was more broad based.
Our truth with spiritual references and ties can be found in our Catechism, this was a life-long work of Pope John Paul the Great and it is fabulous. You can score one for yourself if you want to seek more abt where and what the fullness of truth is. While there is truth in other Christain sects, our is the fullness because it includes the sacraments given to us by Christ…that is why we hold ours as the fullness of the truth.