It’s obvious that you did not read the Catechism
Did you miss this part?
“”The Church is one because of her “soul”: “It is the Holy Spirit, dwelling in those who believe and pervading and ruling over the entire Church,””
You made the comment “Dear Sister, the protestant belief that their scripture interpretations are always guided by the Holy Spirit is the cause of these groups you mention.”
My question is a simple “yes” or “no” question. “Does the Holy Spirit lead the individual Roman Catholic to believe that what the church teaches is truth?”
I did not ask if the believer is “indwelt” by the Holy Spirit.