There are 30,000 Christian sects, with a wide range of interpretations, so to claim Christianity has to do with following your particular doctrinal understanding is illogical.
Of course JWs are Christian.
http://www.merriam-webster.com/dictionary/christian
Definition of CHRISTIAN for Kids
http://dictionary.cambridge.org/dictionary/english/christian
someone who believes in and follows the teachings of JesusChrist
JWs believe in Jesus and follow their interpretation of his teachings, just as you do, and people of any of the 30,000 Christian sects do. They think your interpretation is flawed just as you think their interpretation is flawed.
Funny that you say they are not Christian, they say you are not a true Christian, but you are both are both trying to achieve the same thing.