asalamu alikum brothers and sisters the point should not be whether a muslim man can or cannot the point should be is why would he, first of all there are many muslim women all over the world to choose from and the problem with marrying a christain women is dependent if she is chaste and what country you are in and what laws do they have, most western judeo-christain countries most of the times give full rights to the mother. and if she is christain most likely she will take them to church and thats why a muslim should marry a muslimah.