[Petronski]

They all believe most non-Roman Catholics are going to hell because they believe their Magisterium is infallible when it tells them there is no salvation outside the church in Rome.

This is where words matter. It's not "non-Roman Catholics," but rather "non-Catholics." You have no idea how this is defined, or you do and don't care. I think it's the former.

Oh, and you say "the church in Rome" like it is a building. The Catholic Church is the body of all believers in Christ.

[Marysecretary]

Yes, the catholic (universal church) Is ALL of the believers, not just Catholics.