The Nazis came to power with 33% of the vote mate.
No reason why an energized motivated Muslim population could not do the same.
But of course this isn’t a threat to liberal democracy 
The issue you have with Russia is it is no longer communist, and it’s noteworthy that you regard Russia as such a threat while ignoring China, the actual biggest threat to global democracy. But they have retained communism so they are the good guys, right?