Your spam is getting ridikulus Oberyn. We got your point quite a few pages back: muslims needs getting out, not getting in again ever, with the help of immigration laws, border controls, etc.
Lets say, that the problem is Islam. You stop people from believing in Islam, from entering your country. How do you deal with converts from inside your country? How do you deal with people with french papers, from embracing terrorism? You cannot.
If really, the problem was Islam itself, the only way to fight it, would be to ban the religion itself (or reform it completely, not going to touch on that). Practical problems aside, it would also create tension, crime, and terrorism. And if you ban a religion, why not the others? Even though Islam has the most problematic extremists today, every religion can be turned into a bomb to harm your fellow countrymen.
So lets say you ban all religions, and strictly control your immigration. What will stop one man, from one the corner of the world, if he is dedicated enough, to come and bomb the shit out of you? Only the security force of your nation can help you against him, and sometime they will fail, and people will die.
Until all religions are eradicated worldwide, you will see this shit happen again and again, you can slow it down, but you cant stop it altogether, even if you turned your country into a strict gated community, vastly decreasing the quality of life of 99.9% of innocent people.
Not to add that, religion is only one side of terrorism... People will resort to extreme acts when pushed to their limits, and where there is war (be it in the mind, or in your streets), there is people turning to terrorism.