According to the article that I linked, although it may being that way (I have read of areas governed by dual systems), it does not necessarily apply only to Muslims.
In Austria, the government is convicting even non-Muslims of violating Sharia law. In 2011, Vienna High Court upheld the lower court conviction of Elisabeth Sabaditsch-Wolff for making this factual statement about Muhammad:
"We all know that Muhammad married Aisha when she was 6 years old and consummated the marriage when she was 9. Now, what do we call this behavior if not pedophilia."
disclaimer: I'm only citing this article as an example, not endorsing it. If you question it's accuracy, please double-check.
About Genocide By Assimilation
Want DP delivered to your inbox daily? Subscribe here: