Not entirely. They saved Europe. But, 800 years later, Europe is preparing to fall to Islamic rule after all.
The goal of the Crusades was to recapture Jerusalem and the rest of the Holy Land.
That failed.
The Muslims weren't invading the west; they were holding on to their captured lands in the near east. They succeeded; the Crusaders, after all, were driven from Jerusalem, for good.
In the 1600's the Turks WERE driven out of Europe. Perhaps your time line was a few centuries off.
1621-1631: Poles defeat Turks in battle, but Turkish attacks continue for ten more years.
1633-34: Poles attack Turks, Russians, and Swedes.
1648, 1651: Rebellion of Cossacks against Polish nobles. With armed aid from Tatars and Turks, hundreds of thousands of people are massacred.
1654-1655: Russia attacks Poland and conquers eastern part
1672-1673: Turks attack Poland; Poland loses two-thirds of Ukraine.
1673: Turks defeated.
The Turkish defeat at Vienna is considered one of THE MOST crucial successes of Europe.
THIS time in history the "invasion" is from INVITATION. First world countries INVITED foreign labor. They MIGHT have invited other Christians as foreign labor, but they didn't. They invited the Turks this time...not soldiers but workers, both genders. It's no surprise that they stayed, became citizens and had oodles of children. It's no surprise that they practice their religion.
What is so surprising is the affronted reaction by Christians DECADES after the fact. Too late now to kick them out. They are second generation citizens now.
Or, are you in favor of ethnic cleansing?