Not believing Jesus is God I do not believes condemns them, for this is what Jesus says is required for salvation:
Matthew 19:16 Someone came to Jesus with this question: “Teacher, what good deed must I do to have eternal life?” 17 “Why ask me about what is good?”Jesus replied. “There is only One who is good. But to answer your question—if you want to receive eternal life, the commandments.”
18 “Which ones?” the man asked. And Jesus replied: “‘You must not murder. You must not commit adultery. You must not steal. You must not testify falsely. 19 Honor your father and mother. Love your neighbor as yourself.’
Jesus is saying how you treat others is what saves you. I did not see believing Jesus is God here. Here is Paul in Galatians.
Galatians 5:14 For the whole law can be summed up in this one command: “Love your neighbor as yourself.” 15 But if you are always biting and devouring one another, watch out! Beware of destroying one another. 16 So I say, let the Holy Spirit guide your lives. Then you won’t be doing what your sinful nature craves. 17 The sinful nature wants to do evil, which is just the opposite of what the Spirit wants. And the Spirit gives us desires that are the opposite of what the sinful nature desires. These two forces are constantly fighting each other, so you are not free to carry out your good intentions. 18 But when you are directed by the Spirit, you are not under obligation to the law of Moses. 19 When you follow the desires of your sinful nature, the results are very clear: sexual immorality, impurity, lustful pleasures, 20 idolatry, sorcery, hostility, quarreling, jealousy, outbursts of anger, selfish ambition, dissension, division, 21 envy, drunkenness, wild parties, and other sins like these. Let me tell you again, as I have before, that anyone living that sort of life will not inherit the Kingdom of God.
Paul is here saying how you treat others. I do not see believing Jesus is God here.
If someone repents of their sins and accepts Jesus as the messiah would be saved no matter what they believed Jesus to be god or man. It's not part of the equation.
However, the Jehovah Witnesses teach that works are what get you to heaven, which is wrong.
A lot of people may argue that if you don't understand how/why they are saved they are not saved. I, however, say if you follow the will of Jesus and love your neighbor as yourself as a way of life, repent, and dont deny Jesus as the Messiah according to what I see Jesus, Paul and everyone else teaching they will be saved.
Yes, I understand this may be against your particular religion's dogma, but is what I see the bible teaching.
Jesus came and taught love, forgiveness, blessing others as a way to salvation. The modern church can teach go to church, pay your tithes, believe exactly as we believe to be saved.
Do I believe the Jehovah Witnesses is a correct church? No. Do I believe Jehovah Witnesses teach the correct narrow road to heaven? No. I do believe, however, that some may stumble onto the narrow road through the Jehovah Witnesses, just not very many compared to non-cultist religions
Me answer would be similar for Mormons. Wrong teachings, cultist, but some may find the way.
It is my concern that a lot of religions teach that you have to believe their religious dogma to be saved. The bible teaches that it is repentance and forgiveness which saves.
The Bible teaches it is how you act that determines if you are saved. Most religions are teaching it is what you think that saves you.