The humor was only to the extent that I know you are not going to run to the nearest priest, even though you and everyone should.
There is one moral law, that men know intuitively and imperfectly, and the Church — the Catholic Church — knows in full. So the priest is the best one to ask, but of course the Church does not make a secret of the moral law, so many non-Catholic moral authorities also exist and are credible. Whether they acknowledge that or not, they have their knowledge from the Church. (The Scripture — the source of authority usually claimed — also came from the Church).
As to the morals of individuals, it is usually not the matter of knowledge but the matter of obedience. There are immoral Catholics and moral non-Catholics.
Does it explain things better?
“The Scripture — the source of authority usually claimed — also came from the Church”
Odd. I thought it came from God. But I do now understand that you were not deliberately trying to sound like an intolerant jerk, I mistook you and I profoundly apologize.