I don’t want to sound patronising here, it’s a genuine question. But how old are you? We had the Gulf War in 1991. We had the carving up of the Middle East after WW2. If we want to go back really far we had the Crusades. And this is just Islam in the Middle East. To say the West has only been exposed to it in the past 20 years is mental. 9/11 was just over 20 years ago and the West was well aware of Islam then.I have always got the impression that Islam is essentially a primitive religion that the west have only really been exposed to in the past 20 years, with immigration being much larger in scale.
It's clear Islam is quite sexist in the way it views women. Someone I work with who is Islamic by descent cannot be photographed, cannot date (have to marry instantly), has to cover head etc. No matter how you explain out of that, women to cover up and be treated as less than equal is primitive by modern standards.
You also mention Islam in regards to immigration. Which specific countries are you talking about because there are Muslims all over the World? Britain has had immigration from African and Asian Muslims for way longer than 20 years ago.