@DominicSJMB You’re perfectly okay with your questions. I just wanted to understand where you’re coming from and warn you that there’s no genie in the bottle here. Keep asking questions, but also make sure you’re steeping yourself heavily in the Bible. I can recommend some teachers for you to listen to if you’d like, and I know others in this community can as well. The caveat, of course, is that you shouldn’t take my/our word for it, but check everything you hear against the Bible.
There is no consensus opinion on Catholicism in Connect or RZIM in general. RZIM broadly employs Christian leaders and teachers from different denominations with differing views on theology. Connect has an even more diverse theological pool, understandably, as its on the internet!
That being said, there are two major differences between Catholicism and Protestantism:
Apostolic succession / True Church - Catholicism claims Peter as the first pope, and thereby believes that Church authority can only be passed on through an official line of succession. Thus, anyone starting a church independently, and not being ordained by the Roman Catholic Church, would be outside of the “True or Universal (Catholic) Church.”
Canonical vs. Sacred Tradition Authority - My understanding is that the Catholic Church holds Tradition and Biblical authority in equal regard. Catholicism believes that Tradition gave us the Bible and that it is inseparable from it. Protestantism holds to Sola Scriptura, which states that the Bible is our final and ultimate authority on truth. Catholicism does not believe that Tradition can contradict Scripture, Protestantism does. There’s also the separate issue of the Deuterocanon (OT Apocrypha), which lends added doctrines to Catholicism that Protestants to not adopt.
These things can be debated forever. Look into it for yourself, praying and relying upon the Holy Spirit to give you insights into the revealed Word of God.
I hesitate to give you this resource, but I will, I think you can handle it. If you are comfortable in Catholicism then perhaps you wouldn’t mind testing your faith. The tone of this website is not soft, but the author cites extensive quotes from the Catechism and other Catholic resources that, in the Protestant review, seem to readily contradict Scriptural doctrines.
Blessings in your studies!