I do not believe you can ever have a clear and clean cut seperation though, unless you're willing to entertain the idea to withhold any goverment positions from worshippers.
You can never be completely reassured there is no ulterior motive, whether that motive stems from religion, corporations, or something else. But I do think (and see that in national politics) that many religious people are able to separate what they think is morally good from what society thinks what is morally good. Just witnessing other cultures for some time will give rise to the realization that your truth is just one truth.
I am confident that cultures will eventually blend. It's just harder when the are further apart.
What most people in the west haven't realised is that it's Osama bin Ladin that has the theological backing, not the muslims that just wants to go on with their lives.
As for your last comment I hope it's the case, but if it happens it will be despite Islam. A muslim is for example forbidden in the Qu'ran to take any friends among Jews or Christians. Unless it is a feigned friendship for benefit, in which case the Qu'ran condones it.