If you take all the immigrants that comes from war districts, sick districts with bad education and your country places them into one single area, what do you think will happen? It will not thrive, that's for sure.
And Gaddafi was a total megalomaniac and totally insane, his words have no strength and that muslims would take over europe is a insane idea.
When a nation takes in immigrants its the nations responsibility to make sure that the people that immigrates gets jobs, get educations, and integrates with the society. Religion isn't based in blood, what do you think happens to a child that grows up in a primarly atheist society? That child wont be as strong muslim as the parents.
And its not physically possible that 50% of all children that where born in the UK 2012 where born by muslim parents.
And to a even more important point of the problem, Muslims are people to.
They don't want to live in poverty, they don't want to live in bad neighborhoods why do you think they emigrated in the first place?