Both the LDS and JW’s condemn other denominations as false churches. The only personal association with non-members they are supposed to have is for recruiting new members.
Neither use the Bible as a real source of their faith, they have “other books” for that.
So, no, they aren’t “Christian” any more than Scientology is. lol.
http://www.youtube.com/watch?v=n3BqLZ8UoZk
and
http://www.youtube.com/watch?v=Fw1Vg8HsMK4&feature=related