I think Europeans achieved their current economic development by importing cheap Muslim workers.

I think the labor of Muslim workers (mostly Turkish) played a role, but a minor one. The wages of these workers quickly rose to normal levels in Europe. And this was a win-win situation as the Muslim workers could earn way more money than in their home countries and they had much more physical safety and political stability than before.

By the way, Do you want Muslim workers living in Europe to leave Europe?😯

• Is it important what I want?
• No. In think that people already (legally) living in Europe should have and probably have the right to stay in Europe.
• I think that it is reasonable for a country to exactly define what kind of immigration it wants. Canada and Australia had or have such policies. For example a country can define positive criteria for potential immigrants: no criminal record, ability to speak the country's language(s), education level, certain skills that are in high demand, perhaps wealth (ability to contribute to the country's tax income), ...
• Unfortunately some countries are unable to integrate immigrants properly, e.g. Germany hasn't been able to integrate its millions of Turkish immigrants (as compared to Switzerland that does relatively well).