This post is a perfect example of why social conservatism is stupid.
You want to oppose importing terrorists eh? How do you go about doing that, pray tell? First of all, just in case you weren't aware: all of the successful terrorist attacks that happened in France weren't caused by Syrian refugees. They were carried out by people who emigrated years prior, who'd been setup as sleeper cells until the time was right to strike. So what do you do to prevent them from entering the country? Prevent anyone who looks vaguely Arabic from entering? That's millions of people you're suddenly blocking there to prevent 0.01% of them (if that) from entering.
But that's not all, is it? There are already millions of them on your soil. Do you kick them out too? People who might've been here for generations, who have families, friends, a job and are perfectly normal citizens? Because if you don't, that leaves hundreds of possible sleeper cells around.
And then, that's not even solving the issue fully. There have been terrorist acts carried out by converted Westerners too. How do you go about preventing that? Ban Islam entirely? That's again millions of people, some of whom have been here for so many generations they're an integral part of your country's history. Plus, it won't really help, since those converted people know how to act "normally" since they've been raised that way and were only converted later on.
But no matter, even if you fixed that miraculously, you'd still have school shootings and crazies like Anders Breivik who are literally indistinguishable from the rest of your population and who can carry out atrocities just as well as that horrible Muslim you're so scared of.
Here's the funny thing too: regardless of where you stop in this dangerous trend, you've still created two classes of people: those who can live in your country and those who can't. You've removed their freedom to "protect" yours. You've failed to achieve what you set out to do, unless you are so egotistical to only care about yourself. And if you're American (which is a pretty good guess from the tone of your post and the website it was posted on), you've also gone against the one thing that made it into what it is: that everyone stands equal and everyone has a chance. Now you don't stand a chance if your skin is brown. Welcome to the Confederacy.
TL;DR: Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety.