I can't believe that JW's are classed as non-christians on this site.
They believe Jesus is the Christ
They believe he died for our sins
They believe he's the son of God
They accept the whole Bible without adding or taking from it.
Just because they don't accept the rulings of the council of Nicea, it doesn't make them not christian.
They deny the deity of Jesus, but you will find that christians aren't actually required to believe he is God, but to put faith in his sacrifice for our sins.