laity in Roman Catholicism cannot understand Scripture on their own
Scripture guided by tradition and reason. We are not on our own.
That you have to believe this for your salvation is your mortal sin
Its not getting across, so ill stop here. We are not allowed to commit mortal sin, so we would not follow the pope if he could try to command us to do so. Your sequence of logic there is backwards. Til next time FRiend.