The total European population is growing by about 0.1% per year. and is expected to start falling soon.
For Germany the muslim population is expected to reach 11% in 2050 if zero new refugees arrive starting in 2017
Or 20% if 2014-2016 levels of immigration are kept. So in reality it’s probably somewhere inbetween.
Islam is not just growing compared to the rapidly declining christianity, but also in total.
Recent studies in Germany show that the average Muslim is even more anti-semitic than far-right voters.
https://www.mdr.de/nachrichten/deutschland/gesellschaft/antisemitismus-studie-muslime-afd-100.html
But yes, there haven’t really been any attempts to get involved politically yet.
There the far-right definitely is far more dangerous.
But it surely is a topic we shouldn’t ignore.
I think the closest you get to that is if you counter-sue (or they get sued for lying in court, etc.) the accusers and win.