The Magisterium (practically speaking, the bishops) is not the Church, and I proved this, definitively, by quoting the Magisterium's own words from the Catechism. You believe that the Magisterium IS the Church, because you made it perfectly clear that should the bishops all expire at the same moment, the Church would cease to exist.

You believe in the Magisterium, and yet you don't. You have contradicted and destroyed your own argument.