What European experiment?I am anxious to find out this myself, and I'm glad you asked, but you aren't likely to get anything from the Leftists here...I don't think I've ever seen an honest straightforward answer to anything out of them.
Islam is not just a religion, it is a very harsh political philosophy as well....one that encompasses all aspects of life; hates the idea of separation of Church and State....in fact in their world they will cut your head off for advocating for it; their goal is for everyone to be a Muslim; they are completely intolerant of women's rights; certainly Gay rights; will not assimilate.
The European Experiment ought to be enough of an example to minds accessible to reason.
Good Question.