Are you saying you don't understand the difference between "using Scripture" and basing the Church's authority from it?
tsk, tsk, tsk. Sounds like a bit of a shell game being played there.
There's a "game" alright being played. The classic "Bait and Switch" one.
Come to the Roman Catholic Church if you want to be saved.
Okay, I'm here, am I saved?
Uh, no, nobody can KNOW they are saved...