Two points: 
1) Europe has been attempting to resist Persian invasion/immigration for over 1000 years. It is just recent history that Europeans have forgotten one of the founding principles of the continent. Turkey has always been the barrier between these two civilizations.

2) Islam by definition is incompatible with Western Civilization for the following reason: Islam is a Political Structure whereas Christianity and Judaism are not. For example, the US Constitution explicitly forbids government imposing religion on it's citizen( 1st Amendment); whereas, Islam demands that Sharia Law take precedence. This is clearly in conflict with the 1st Amendment. 


Cheers