"Only in matters of 'faith and morals'" re
..is the way I heard it.
Normal Catholic doctrine (though I'm not sure if it is an official Church position) grounds our ability to understand the universe in faith. Thus, matters of faith can be easily extended to cover anything.
But I was speaking in a more casual sense. Anybody that rises to the level of Bishop in the catholic church might have his points of disagreement with the church, but will in general follow the Catholic party line. Including the concept that the church is a single monolithic structure lead from the top. That is a basic point of the Catholic faith, if you don't agree with that it is hard to say you are a Catholic.
(...back when such futile discussions seemed like a lot of fun.)
Everything we do is ultimately pointless and futile. Better to learn to enjoy the trip then agonize over it.
Jay