If you're right, then being or not being a member of a Catholic Church has no bearing on a person's salvation. And in that case you're stuck with a pointless argument.
Your sustained rant about Catholics is utterly misplaced, and laughably irrational.
I suggest that you focus more on addressing the serious logical difficulties of your statements.
No, because one stays in the Catholic Church because they believe that it is needed for their salvation.
The RCC preaches a mixture of works and faith for salvation, so stop trying to throw up smoke to obscure the issue.
Mixing faith with works, results in eternal damnation as the Book of Galatians makes very clear.