The immigration cannot be stopped without seriously inhumane measures like shooting at people who try to cross your border. And even that will barely make a dent. I'm not giving up my humanity for a few percent drop in immigration. The immigration situation in Europe is born of the knowledge that if you want this to happen peacefully you have to give immigrants a shot at making a life here without having to turn to crime.
The fact that this bothers you is more proof of the succes of right wing propaganda than anything else.
If you look at the past there have always been people moving about, sometimes they successfully integrated or mixed cultures, sometimes it was genocide in one direction or the other. Hard measures like seriously closing borders are bids for war.
I'd say that you are spot on and people in the West who want to believe in strange middle east cults can do so quietly at home and not bother anyone with their hokey faith. That goes for Muslims, Jews, Christians and the rest of them.