Muslims stand by their religion entirely. It is a sort of religious absolutism. While Europeans have stopped defending the values of their civilization. They confuse tolerance with relativism.
Pluralism and tolerance are pillars of modern society. That has to be accepted. But pluralism doesn't just mean diversity. It means that we share the same rules and values, and are still nevertheless different. Islam doesn't have this idea. And Islam also has no tradition of tolerance.
Accusing somebody of racism is a very effective weapon in Germany. Islamists know this: As soon as you accuse someone of demonizing Islam, then the European side backs down.
Unlike multiculturalism, cultural pluralism doesn't just mean diversity but also togetherness - primarily the understanding of the rules of the game - the European values structure.