Alaykumu salam ua rahmatullah,
It is allowed for the men to marry women who are not muslims, but still nowdays is not very advisible. They could do to you many unknown things. For example take to church your kids meanwhile you are at work until you hear them one day say to you "father may you be blessed by the holy spirit". And above all, men need muslim women to teach their children qur'an and sunnah. This is a very important issue that let alone the disbelieving women cannot do this, but now days even our sisters are having some issues. They teach them some greek aristotle philosophies insdead of Tawheed of Allah, or they have the sabr to teach them who was Mozart the kafir that when he would write his music had to be drunk, or other times he would urinate from his window down in the neighborhood. So our sisters insdead of teaching the children who was Umar ibn Hatab radiallahu anhu have started do other things.