Similar thing applies to Christianity and other religions too. The Western world has been so successful on various fronts (especially on the modern, liberal and progressive cultural front) essentially because they defeated and discarded the barbaric Christianity by what we now call "separation of Church and state".
But Islamists (Muslims who wish/strive to bring Islam as ruler in the world) are trying to bring Sharia in the western world and the liberals here are quite dishonest about it.