@ the number jumble above: Adding a predominantly Muslim nation to "Europe" will of course change the number of Muslims in "Europe", but as "Europe" no longer seems to be the same area it traditionally was, maybe we should go right ahead and start adding big chunks of the Near East to it to make the number even bigger.
Regardless, none of those numbers mean that Islam is taking over in Europe, nor is it likely to. People who are disillusioned with Christianity are hardly likely to seek solace in a broadly similar monotheistic Abrahamic religion with similar (and different) restrictions/rules and so forth.
I was pondering this question when I passed a local Halal butchers, and it occurred to me that large numbers of people in the west think that Halal butchery is inhumane. Would these people agree to Islamic rule, which might well involve an overall tendency towards Halal methods?
Likewise there are far too many people who would resist (with force no less) any move towards the more oppressive aspects of Islam (in a worse case scenario compulsory beards, no flying of kites, burkhas etc.) which includes a substantial Sikh population. From experience (and historically speaking), Sikhs HATE Muslims more than any member of the BNP or Combat18 does. Granted they wouldn't have an issue with the beard thing, but its unlikely that any area of Europe with a substantial Sikh population is going to go gently unto Islam. They vote as well. Likewise other religious groups will no doubt resist Islamic influence.
I could go on. How about the fact that Government sponsored secularisation is likely to stay secularised, not be replaced by Islamic concepts? How about the fact that a change over to Islamic "rule" would inevitably require an almost "Fahrenheit 451" level of rule to remove unislamic materials and behaviour, which would inevitably be resisted?
Its not going to happen. stop panicking. The West enjoys too many things that are UnIslamic to ever change over. (Kissing in public, drinking, drinking more, not stoning people to death for bugger all, not state-sponsoring rape/murder, more drinking, pig-products, arranged marriages, female circumcision, hatred of homosexuality...) All these things and more appear in islamic nations, and the greater part of them are not ever going to be popular choices in a western nation.
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"There is a time when the operation of the machine becomes so odious, makes you so sick at heart,
that you can't take part" [Mario Savo, 1964]