But the difference between this and the situation that you state (gov school) is that the Church is not just a school where you abide your time. The Church is THE Community of God, Our Family. We don’t abandon them, even if they make mistakes. If it is being destroyed by a weird cousin , then the apostate gets pushed out, not the orthodox.
The church is not the same thing as The Church. Christ knows His sheep.
All the best with that. Unfortunately, the faithful in the mainlines aren’t winning that battle.