You crush the Islamic empire by crushing the capital. There is ZERO tolerance for any other faith under Islam. The concept of “muslim lands” is one of supremacist thought.
The muslims in those nations are just as discriminatory against the natives who convert away from Islam (in fact they face a death penalty that the lowly kufir don’t even face because we’ve never been muslims in the first place).
They can worship a moon god if they want just as a neo-nazi can worship hitler and an anarchist can worship Marx. They cannot impose their totalitarian system on the world.
They can die trying , and take us along with them. - tom