So you are advocating prohibiting these refugees from practicing their religion? If the refugees were, say, members of the Syrian Orthodox Church (as no doubt many of the refugees are), would you advocate a prohibition on the building of a new church?
I find it astounding to me the degree of hatred and suspicion that is leveled against Muslims. Keep in mind that these refugees are fleeing the brutality of both ISIS/ISIL and the Assad regime. The likelihood that these refugees represent some kind of "fifth column" of IS agents intent on destroying Europe reeks of both racism and paranoia. And I would like to note that Muslims are a diverse group of people, and the overwhelming majority of Muslims are not terrorists, nor do they have any desire whatsoever to commit acts of violence against others.
Now before I get accused of being an apologist for Islam, I am an agnostic with a bias towards atheism who rejects all organized religions and have criticized all religions, including Islam. At the same time, I have personally known many people who are either practicing Muslims or come from Muslim religious backgrounds -- people I consider to my good friends -- and they are no different than any of my other friends, among whom include Christians of various denominations, Jews, Hindus, Buddhists, Sikhs, Parsis, and also those who reject all traditional organized religions like myself.