I do not know if the Muslims are spirit to conquer the world as you say it, because I think that they are to watch is fought by the other armies of the world. But I think that they would need to be much more watchful towards them and for it to watch what is said in mosques in Europe.
They are not so stupid as to openly in the European mosques promote Jihad. They are campaigning to visit a Muslim country and there are already agitating their supporters. They are very difficult to expose. Terror is a war without rules.