If, I can add to Cecil’s answer to why the Islamic world is hostile, there is another factor. Much of Islamic ideation is to convert or conquer people and countries that are not Muslim. You forget the Muslim invasions all over the world to fulfill this premise.Esp the failure to take Europe in spite of over 500 years of occupation in Spain. This fueled fear in the west and added to the brutality of the Crusades.
Some how this gets left out of the equation. The battle of Tours and the Battle for Vienna are significant reminders that the arrows of fear and mistrust go both ways.
And the people who lived in those lands before the Muslims came were also invaders, as were the people they took it from, and the people before them. You run out of historical records before you run out of waves of invasion.
Pope Urban’s speech kicking off the First Crusade specified it as a response to invasion: at that moment it had been the Seljuk’s spread, but apart from the fact Muslims had no more brotherly love than Christians and warred amongst themselves and there were a number of Muslim players in the game; they had only been around Jerusalem just over 400 years — bearing in mind Islam was just born then when it started grabbing everywhere — and had taken two thirds of Christendom, leaving only tiny Europe for later, the Fatamids actually lost the city for a few years previous, and then again to the Christians.
Abrahamic religions are all very morose and heavy-handed…
Then by that logic it was high time someone kicked them out in turn.
Left alone that would have been the Mongols. They generally succeeded.