"Orthodox Christian" and "Christian" are not necessarily the same thing. The JW are unquestionably not "orthodox" Christians. To a Baptist, the Eastern Orthodox and Roman Catholics are not "orthodox" Christians. Free Grace Christians are not "orthodox" Christians to most other Christians.
The question is, where does "non-orthodox" end and "non-Christian" begin?
This was the point of my thread "Give us your absolute bottom-line Christian essentials" on the Apologetics forum. What are the
essentials - not the "orthodox" understandings - for being a Christian? Given a direct opportunity to state the absolute essentials, damn few people stepped up to the plate. The silence was deafening.
Is the deity of Christ an
essential? The JW believe Jesus is God's chosen vehicle for salvation, that salvation is through the life, atoning sacrifice and resurrection of Jesus. I believe this is the
essential.
If one doesn't believe in the Deity of Christ one is essentially an atheist.
We believe in Jesus, who said: “I am the way and the truth and the life. No one comes to the Father except through me.” (
John 14:6) We have faith that Jesus came to earth from heaven and gave his perfect human life as a ransom sacrifice. (
Matthew 20:28) His death and resurrection make it possible for those exercising faith in him to gain everlasting life. (
John 3:16) We also believe that Jesus is now ruling as King of God’s heavenly Kingdom, which will soon bring peace to the entire earth. (
Revelation 11:15) However, we take Jesus at his word when he said: “The Father is greater than I am.” (
John 14:28) So we do not worship Jesus, as we do not believe that he is Almighty God.
Source:
https://www.jw.org/en/jehovahs-witnesses/faq/believe-in-jesus/
Is the above the "orthodox" understanding? No. As one delves deeper, one learns that the JW's understanding is somewhat more "unorthodox" than the above suggests. It is quite a leap, however, to suggest that this makes them non-Christian, a leap that I am not willing to make.
Matthew 7:16 says we will know false prophets by their fruits. In my experience, JW exhibit the fruits of the Spirit to a higher degree than almost any other community of believers.
The notion that "orthodox" (
always, of course, meaning "my particular understanding of orthodoxy") defines "Christian" is one of the really huge, divisive mistakes.
That Jesus was "divine" in some sense does indeed date back to the earliest Christian community. The notion that he is God, the Second Person of the Trinity, does not. The JW believe Jesus is divine; they do not believe He is God. Their position is non-mainstream, non-orthodox, but I do not see it as non-Christian.